CLN: Standardize searchsorted signatures

[gfyoung]

The parameter is "value" across the board.

xref #14645.

[pep8speaks]

Hello @gfyoung! Thanks for submitting the PR.

• There are no PEP8 issues in the file pandas/core/arrays/categorical.py !

• There are no PEP8 issues in the file pandas/core/base.py !

• There are no PEP8 issues in the file pandas/core/indexes/period.py !

• There are no PEP8 issues in the file pandas/core/indexes/timedeltas.py !

• There are no PEP8 issues in the file pandas/core/series.py !

• There are no PEP8 issues in the file pandas/tests/arrays/categorical/test_analytics.py !

• There are no PEP8 issues in the file pandas/tests/indexes/period/test_tools.py !

• There are no PEP8 issues in the file pandas/tests/series/test_analytics.py !

[codecov]

Codecov Report

Merging #22670 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #22670      +/-   ##
==========================================
- Coverage   92.17%   92.17%   -0.01%     
==========================================
  Files         169      169              
  Lines       50708    50702       -6     
==========================================
- Hits        46740    46734       -6     
  Misses       3968     3968

Flag	Coverage Δ
#multiple	90.58% <100%> (-0.01%)	⬇️
#single	42.34% <100%> (-0.01%)	⬇️

Impacted Files	Coverage Δ
pandas/core/arrays/categorical.py	95.74% <ø> (-0.01%)	⬇️
pandas/core/indexes/period.py	93.48% <100%> (-0.02%)	⬇️
pandas/core/series.py	93.72% <100%> (-0.01%)	⬇️
pandas/core/base.py	97.6% <100%> (-0.01%)	⬇️
pandas/core/indexes/timedeltas.py	91.16% <100%> (-0.03%)	⬇️
pandas/core/indexes/datetimes.py	95.67% <100%> (-0.01%)	⬇️

---

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[gfyoung]

Anyone have objections to this PR? This is a pretty cut and dry deprecation removal.

[jreback]

lgtm