📚 Fix escape sequences

[ubmarco]

This fixes the docs build warnings emitted by RST highlighting:

<unknown>:1: SyntaxWarning: invalid escape sequence '\.'
<string>:1: SyntaxWarning: invalid escape sequence '\.'
<unknown>:1: SyntaxWarning: invalid escape sequence '\w'
<string>:1: SyntaxWarning: invalid escape sequence '\w'

Not sure about the solution though, could also be the need-example directive has a bug.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.60%. Comparing base (4e10030) to head (07b2003).
⚠️ Report is 176 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1470      +/-   ##
==========================================
+ Coverage   86.87%   88.60%   +1.72%     
==========================================
  Files          56       61       +5     
  Lines        6532     7259     +727     
==========================================
+ Hits         5675     6432     +757     
+ Misses        857      827      -30     

Flag	Coverage Δ
pytests	88.60% <ø> (+1.72%)	⬆️

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[chrisjsewell]

cheers