Make `rails runner` command options more obvious
Make `rails runner` command options more obvious


We're surrounding the options in angle brackets `<>` as is convention in `curl`:

```
$ curl --help
Usage: curl [options...] <url>
```

And then in square brackets `[]` with bars `|` as in `tar`:

```
$ tar --help
...
Create: tar -c [options] [<file> | <dir> | @<archive> | -C <dir> ]
```

To further clarify that the command can be used with both, we now show examples:

```
Examples:
    rails runner 'puts Rails.env'
        This runs the code `puts Rails.env` after loading the app

    rails runner path/to/filename.rb
        This runs the Ruby file located at `path/to/filename.rb` after loading the app
```

This format was taken from the `find` man pages:

```
EXAMPLES
     The following examples are shown as given to the shell:

     find / \! -name "*.c" -print
             Print out a list of all the files whose names do not end in .c.

     find / -newer ttt -user wnj -print
             Print out a list of all the files owned by user ``wnj'' that are newer than the file ttt.
```

The the text at the bottom is also shifted to improve readability.
richseviora/rails,georgeclaghorn/rails,pschambacher/rails,richseviora/rails,rbhitchcock/rails,rails/rails,joonyou/rails,ngpestelos/rails,eileencodes/rails,MichaelSp/rails,tgxworld/rails,esparta/rails,sergey-alekseev/rails,ngpestelos/rails,travisofthenorth/rails,tjschuck/rails,fabianoleittes/rails,assain/rails,brchristian/rails,ledestin/rails,mijoharas/rails,lcreid/rails,kmayer/rails,sergey-alekseev/rails,palkan/rails,kenta-s/rails,pvalena/rails,mtsmfm/rails,mohitnatoo/rails,illacceptanything/illacceptanything,amoody2108/TechForJustice,betesh/rails,joonyou/rails,maicher/rails,illacceptanything/illacceptanything,vipulnsward/rails,hanystudy/rails,rbhitchcock/rails,yahonda/rails,kachick/rails,rafaelfranca/omg-rails,Edouard-chin/rails,repinel/rails,mtsmfm/railstest,illacceptanything/illacceptanything,rails/rails,illacceptanything/illacceptanything,kamipo/rails,pvalena/rails,iainbeeston/rails,bogdanvlviv/rails,notapatch/rails,koic/rails,shioyama/rails,betesh/rails,Edouard-chin/rails,ngpestelos/rails,utilum/rails,coreyward/rails,lucasmazza/rails,yawboakye/rails,kachick/rails,marklocklear/rails,kmcphillips/rails,xlymian/rails,Envek/rails,amoody2108/TechForJustice,notapatch/rails,illacceptanything/illacceptanything,koic/rails,printercu/rails,Erol/rails,prathamesh-sonpatki/rails,jeremy/rails,aditya-kapoor/rails,88rabbit/newRails,sealocal/rails,elfassy/rails,deraru/rails,yawboakye/rails,pvalena/rails,kmcphillips/rails,illacceptanything/illacceptanything,brchristian/rails,starknx/rails,mtsmfm/railstest,yhirano55/rails,MichaelSp/rails,yalab/rails,felipecvo/rails,flanger001/rails,EmmaB/rails-1,baerjam/rails,mechanicles/rails,Sen-Zhang/rails,matrinox/rails,Edouard-chin/rails,kddeisz/rails,arjes/rails,untidy-hair/rails,bogdanvlviv/rails,assain/rails,kirs/rails-1,samphilipd/rails,fabianoleittes/rails,yalab/rails,maicher/rails,utilum/rails,rbhitchcock/rails,esparta/rails,lucasmazza/rails,tjschuck/rails,mathieujobin/reduced-rails-for-travis,baerjam/rails,gfvcastro/rails,illacceptanything/illacceptanything,arunagw/rails,mathieujobin/reduced-rails-for-travis,stefanmb/rails,mechanicles/rails,vassilevsky/rails,gauravtiwari/rails,kirs/rails-1,joonyou/rails,lcreid/rails,fabianoleittes/rails,yasslab/railsguides.jp,EmmaB/rails-1,gavingmiller/rails,MSP-Greg/rails,alecspopa/rails,kmayer/rails,pschambacher/rails,gcourtemanche/rails,88rabbit/newRails,bradleypriest/rails,eileencodes/rails,yahonda/rails,utilum/rails,palkan/rails,felipecvo/rails,BlakeWilliams/rails,marklocklear/rails,yahonda/rails,yasslab/railsguides.jp,rossta/rails,bolek/rails,arunagw/rails,richseviora/rails,kaspth/rails,illacceptanything/illacceptanything,baerjam/rails,shioyama/rails,bolek/rails,rails/rails,MSP-Greg/rails,eileencodes/rails,MSP-Greg/rails,betesh/rails,Spin42/rails,elfassy/rails,arjes/rails,aditya-kapoor/rails,gauravtiwari/rails,mtsmfm/rails,EmmaB/rails-1,kirs/rails-1,starknx/rails,Spin42/rails,schuetzm/rails,ledestin/rails,assain/rails,xlymian/rails,Vasfed/rails,alecspopa/rails,Vasfed/rails,mohitnatoo/rails,voray/rails,rafaelfranca/omg-rails,riseshia/railsguides.kr,repinel/rails,riseshia/railsguides.kr,sealocal/rails,kaspth/rails,pschambacher/rails,flanger001/rails,ledestin/rails,Stellenticket/rails,deraru/rails,schuetzm/rails,kmcphillips/rails,yasslab/railsguides.jp,Stellenticket/rails,iainbeeston/rails,kenta-s/rails,illacceptanything/illacceptanything,untidy-hair/rails,voray/rails,bradleypriest/rails,ttanimichi/rails,gavingmiller/rails,illacceptanything/illacceptanything,xlymian/rails,BlakeWilliams/rails,betesh/rails,illacceptanything/illacceptanything,gcourtemanche/rails,yhirano55/rails,joonyou/rails,rafaelfranca/omg-rails,matrinox/rails,ttanimichi/rails,tijwelch/rails,bradleypriest/rails,kddeisz/rails,palkan/rails,gavingmiller/rails,kddeisz/rails,mijoharas/rails,aditya-kapoor/rails,arunagw/rails,riseshia/railsguides.kr,pvalena/rails,matrinox/rails,BlakeWilliams/rails,repinel/rails,rails/rails,mijoharas/rails,marklocklear/rails,lcreid/rails,tijwelch/rails,illacceptanything/illacceptanything,vipulnsward/rails,hanystudy/rails,esparta/rails,odedniv/rails,vassilevsky/rails,voray/rails,deraru/rails,odedniv/rails,Sen-Zhang/rails,untidy-hair/rails,kenta-s/rails,yhirano55/rails,tjschuck/rails,kddeisz/rails,sealocal/rails,MichaelSp/rails,lucasmazza/rails,hanystudy/rails,georgeclaghorn/rails,printercu/rails,MSP-Greg/rails,kmcphillips/rails,maicher/rails,shioyama/rails,untidy-hair/rails,prathamesh-sonpatki/rails,flanger001/rails,elfassy/rails,illacceptanything/illacceptanything,gfvcastro/rails,travisofthenorth/rails,jeremy/rails,coreyward/rails,kamipo/rails,repinel/rails,prathamesh-sonpatki/rails,kamipo/rails,bolek/rails,Stellenticket/rails,schuetzm/rails,iainbeeston/rails,samphilipd/rails,aditya-kapoor/rails,gfvcastro/rails,amoody2108/TechForJustice,gfvcastro/rails,88rabbit/newRails,jeremy/rails,mohitnatoo/rails,brchristian/rails,yalab/rails,shioyama/rails,Edouard-chin/rails,bogdanvlviv/rails,mathieujobin/reduced-rails-for-travis,mechanicles/rails,tjschuck/rails,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