DevelopmentSetup.rst: Change install from git link

Changed the install from git link from <https://api.coala.io/en/
latest/Developers/Development_Setup.html#installing-from-git> -->
<#installing-from-git> to send it to the content in the same page
instead of reloading the whole page to the link.

Closes #5992

docs/Developers/Development_Setup.rst

@@ -77,7 +77,7 @@ in your current directory, as coala only works for Python >= 3.4.4
  `Virtualenv User Guide <https://virtualenv.pypa.io/en/stable/userguide/#activate-script>`__.
 
 - After this, you can start
- `installing from git <https://api.coala.io/en/latest/Developers/Development_Setup.html#installing-from-git>`__.
+ `installing from git <#installing-from-git>`__.
 
 Repositories
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