Gitpod docs: added missing line break (pandas-dev#50888)

* added missing line break

* trim whitespace

* remove unnecessary command

Co-authored-by: Marc Garcia <[email protected]>

Co-authored-by: Marc Garcia <[email protected]>

Author: noatamir

doc/source/development/contributing_gitpod.rst

@@ -145,7 +145,7 @@ docs you need to run the following command in the docs directory::
 
 Alternatively you can build a single page with::
 
-    python make.py html python make.py --single development/contributing_gitpod.rst
+    python make.py --single development/contributing_gitpod.rst
 
 You have two main options to render the documentation in Gitpod.