DOC: Updating str_repeat docstring

[JesperDramsch]

• [ x] tests passed
• [ x] passes git diff upstream/master -u -- "*.py" | flake8 --diff

Updated the Docstring with examples for str.repeat()

[pep8speaks]

Hello @JesperDramsch! Thanks for updating the PR.

• In the file pandas/core/strings.py, following are the PEP8 issues :

Line 689:80: E501 line too long (86 > 79 characters)

Comment last updated on September 01, 2018 at 13:49 Hours UTC

[codecov]

Codecov Report

Merging #22566 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #22566   +/-   ##
=======================================
  Coverage   92.04%   92.04%           
=======================================
  Files         169      169           
  Lines       50787    50787           
=======================================
  Hits        46745    46745           
  Misses       4042     4042

Flag	Coverage Δ
#multiple	90.45% <ø> (ø)	⬆️
#single	42.29% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
pandas/core/strings.py	98.63% <ø> (ø)	⬆️

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[datapythonista]

Great changes, very clear example. Added some comments about minor things.

[jorisvandenbossche]

Nice example!

[JesperDramsch]

I messed up. It goes on here: #22571