Fix broken urls in docstrings

[Muscaw]

I noticed that the URLs for accept_invitation and get_repos are broken on ReadTheDocs.

By adding the underscore at the end, it fixes the link when rendered with Sphinx

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.02 ⚠️

Comparison is base (300c501) 98.77% compared to head (96de0d1) 98.75%.

❗ Current head 96de0d1 differs from pull request most recent head 26c8dbf. Consider uploading reports for the commit 26c8dbf to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2393      +/-   ##
==========================================
- Coverage   98.77%   98.75%   -0.02%     
==========================================
  Files         117      115       -2     
  Lines       11674    11595      -79     
==========================================
- Hits        11531    11451      -80     
- Misses        143      144       +1     

Impacted Files	Coverage Δ
github/AuthenticatedUser.py	99.04% <ø> (ø)
github/Branch.py	92.50% <ø> (ø)
github/Repository.py	97.20% <ø> (ø)
github/Team.py	98.54% <ø> (ø)

... and 7 files with indirect coverage changes

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[EnricoMi]

While we are there, can you also fix the missing _ in

• Branch.py
• Repository.py
• Team.py

I found those occurrences by searching for regexp ">`$":

grep -E -e ">\`$" -R github

[Muscaw]

@EnricoMi Good catch. Thanks for the command.

[EnricoMi]

LGTM! @s-t-e-v-e-n-k @sfdye