Update redismodules.rst

[yanivhershkovich]

Updated links to RediSearch, RedisGraph and RedisBloom sites as they were all pointing to RedisJSON instead.

Pull Request check-list

Please make sure to review and check all of these items:

• Does $ tox pass with this change (including linting)?
• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• Is there an example added to the examples folder (if applicable)?

NOTE: these things are not required to open a PR and can be done
afterwards / while the PR is open.

Description of change

Please provide a description of the change here.

[codecov-commenter]

Codecov Report

Merging #1822 (43b2990) into master (271218e) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1822      +/-   ##
==========================================
- Coverage   94.33%   94.32%   -0.02%     
==========================================
  Files          75       75              
  Lines       15830    15830              
==========================================
- Hits        14934    14932       -2     
- Misses        896      898       +2     

Impacted Files	Coverage Δ
tests/test_cluster.py	98.67% <0.00%> (-0.13%)	⬇️

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[chayim]

Thank you for helping make our documentation better! Merging, and ensuring this is part of the 4.1.0 release.