clarifying regex pipe behavior

[mitchnegus]

Current documentation for pandas.Series.str.contains() states that the | acts as a regex and operator ("Returning ‘house’ and ‘parrot’ within same string."), while I believe it is actually an or operator. I've updated the phrase and example to demonstrate this behavior in what I think is a clearer way, though I'm definitely open to suggestions to improve it further.

• closes #xxxx
• tests added / passed
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

[codecov]

Codecov Report

Merging #21589 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #21589      +/-   ##
==========================================
+ Coverage    91.9%    91.9%   +<.01%     
==========================================
  Files         153      153              
  Lines       49549    49549              
==========================================
+ Hits        45537    45539       +2     
+ Misses       4012     4010       -2

Flag	Coverage Δ
#multiple	90.3% <ø> (ø)	⬆️
#single	41.78% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
pandas/core/strings.py	98.62% <ø> (ø)	⬆️
pandas/util/testing.py	85.27% <0%> (+0.2%)	⬆️

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[jreback]

thanks, yeah this was a typo