docs(segmenter): improve segmenter docstring

[JoanFM]

No description provided.

[codecov]

Codecov Report

Merging #1866 (c7f7f2a) into master (c526d2a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1866   +/-   ##
=======================================
  Coverage   85.93%   85.93%           
=======================================
  Files         146      146           
  Lines        6980     6980           
=======================================
  Hits         5998     5998           
  Misses        982      982           

Impacted Files	Coverage Δ
jina/executors/segmenters/__init__.py	91.66% <ø> (ø)

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[github-actions]

Latency summary

Current PR yields:

• 😶 index QPS at 1169, delta to last 3 avg.: -2%
• 😶 query QPS at 23, delta to last 3 avg.: -1%

Breakdown

Version	Index QPS	Query QPS
current	1169	23
0.9.28	1193	23
0.9.27	1212	23

Backed by latency-tracking. Further commits will update this comment.

[nan-wang]

LGTM👍