[Chapel Merge] Fixed broken link to discourse and swapped columns

Branch: refs/heads/main
Revision: 8e30f0a
Author: mstrout
Log Message:

Merge pull request #18316 from mstrout/buildingdocsMoreDetailFixes

Fixed broken link to discourse and swapped columns in tables.

Made some fixes that @bradcray suggested to the recently merged PR #18115.

Made the "sidebar subheading" come before the "doc name in sidebar" as was suggested by @bradcray in Buildingdocs more detail #18115 (comment)
Fixed the link I broke by taking it out. As was suggested in Buildingdocs more detail #18115 (comment).

[reviewed by @bradcray]

Modified Files:
M doc/rst/developer/bestPractices/buildingdocs.rst

Compare: https://github.com/chapel-lang/chapel/compare/dae7767bb5ef...8e30f0ae2cca