ARROW-11965: [R][Docs] Simplify install.packages command in R dev docs
ARROW-11965: [R][Docs] Simplify install.packages command in R dev docs

Hi

I have used the same setup that I used when I worked in finance, this is to call `R  --vanilla` from the terminal, and use the global CRAN  repository, so that this fix applies to Windows/Mac/Linux.

The changes made solve the following problems:
- Packages not installing because the default mirror is not found
- The lack of packages bit64 and tidyselect

Best,

Closes #9797 from pachamaltese/ARROW-11965

Lead-authored-by: Mauricio Vargas <75919093fc69d86e4175e8385616cffbbcd14f7f@dcc.uchile.cl>
Co-authored-by: Pachamaltese <75919093fc69d86e4175e8385616cffbbcd14f7f@dcc.uchile.cl>
Signed-off-by: Neal Richardson <beb59f0141269d2d04e73d0dcc1967b64ba87e13@gmail.com>

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