Replace dead filter links in documentation

[mtnntn]

Fixes #865

Description of the Change

The following links in the documentation have been updated:

• "ordering filters" in the Ordering Filters section: old -> new.
• "SearchFilters" in the Search Filter section: old -> new.

Checklist

• PR only contains one change (considered splitting up PR)
• unit-test added
• documentation updated
• CHANGELOG.md updated (only for user relevant changes)
• author name in AUTHORS

[codecov]

Codecov Report

Merging #867 (8a9f0af) into master (d8f26fc) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #867   +/-   ##
=======================================
  Coverage   97.74%   97.74%           
=======================================
  Files          60       60           
  Lines        3319     3319           
=======================================
  Hits         3244     3244           
  Misses         75       75           

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[sliverc]

Thanks for spotting those dead links and fixing them.

LGTM.