python caveats: use `>` instead of `>>`
python caveats: use `>` instead of `>>`

The `homebrew.pth` should be a file with a single line in it.
Also (at least on zsh) if the file does not exist, `>>` will
result in an error. The `>` works in both, bash and zsh and
creates the file with the `echo`ed contet.

Closes Homebrew/homebrew#28201.

Signed-off-by: Jack Nagel <43386ce32af96f5c56f2a88e458cb94cebee3751@gmail.com>

rwhogg/brew,nandub/brew,bfontaine/brew,sjackman/homebrew,konqui/brew,Homebrew/brew,DomT4/brew,Homebrew/brew,rwhogg/brew,JCount/brew,AnastasiaSulyagina/brew,muellermartin/dist,JCount/brew,reelsense/brew,AnastasiaSulyagina/brew,mahori/brew,bfontaine/brew,gordonmcshane/homebrew,pseudocody/brew,amar-laksh/brew_sudo,JCount/brew,Homebrew/brew,MikeMcQuaid/brew,tonyg/homebrew,reitermarkus/brew,zmwangx/brew,alyssais/brew,ilovezfs/brew,reitermarkus/brew,vitorgalvao/brew,jmsundar/brew,Linuxbrew/brew,gregory-nisbet/brew,hanxue/linuxbrew,Linuxbrew/brew,tonyg/homebrew,mistydemeo/homebrew,DomT4/brew,maxim-belkin/brew,konqui/brew,alyssais/brew,toonetown/homebrew,nandub/brew,hanxue/linuxbrew,gordonmcshane/homebrew,mahori/brew,staticfloat/brew,reelsense/brew,staticfloat/brew,claui/brew,Homebrew/brew,gregory-nisbet/brew,konqui/brew,nandub/brew,zmwangx/brew,mgrimes/brew,amar-laksh/brew_sudo,ilovezfs/brew,nandub/brew,jmsundar/brew,vitorgalvao/brew,toonetown/homebrew,vitorgalvao/brew,DomT4/brew,MikeMcQuaid/brew,mgrimes/brew,maxim-belkin/brew,konqui/brew,EricFromCanada/brew,claui/brew,MikeMcQuaid/brew,amar-laksh/brew_sudo,toonetown/homebrew,mistydemeo/homebrew,claui/brew,pseudocody/brew,EricFromCanada/brew,alyssais/brew,MikeMcQuaid/brew,sjackman/homebrew,rwhogg/brew,muellermartin/dist,AnastasiaSulyagina/brew,EricFromCanada/brew,palxex/brew,palxex/brew,sjackman/homebrew,mahori/brew,jmsundar/brew,hanxue/linuxbrew,reelsense/brew,Linuxbrew/brew,gordonmcshane/homebrew,mistydemeo/homebrew,maxim-belkin/brew,Linuxbrew/brew,DomT4/brew,muellermartin/dist,sjackman/homebrew,pseudocody/brew,zmwangx/brew,bfontaine/brew,aw1621107/brew,mgrimes/brew,gregory-nisbet/brew,reitermarkus/brew,claui/brew,staticfloat/brew,aw1621107/brew,tonyg/homebrew,JCount/brew,reitermarkus/brew,vitorgalvao/brew,palxex/brew,ilovezfs/brew,mahori/brew,aw1621107/brew,EricFromCanada/brew