[Chapel Merge] Add links to the mason package search from the docs

Branch: refs/heads/main
Revision: 4cc8c4e412b76af57ed9a3b0c0a67da26b828790
Author: jabraham17
Link: Add links to the mason package search from the docs by jabraham17 · Pull Request #28907 · chapel-lang/chapel · GitHub
Log Message:
Add links to the mason package search from the docs (#28907)

Adjusts the mason docs to link to the mason package search

[Reviewed by @DanilaFe]

Compare: Comparing bcb861e4e7b0dd7da5c61901015d8a3727b16987...7bc730267030086155ac9cd055096cf78f33bcd0 · chapel-lang/chapel · GitHub

Diff:
M doc/rst/mason-packages/index.rst
M doc/rst/tools/mason/guide/masonregistry.rst
https://github.com/chapel-lang/chapel/pull/28907.diff