Documentation | Draft: waf: Fix Python warnings (!103)

[Frank Kuehndel (@frank_k)]

Frank Kuehndel created a merge request: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/103

Project:Branches: frank_k/rtems-docs:fix-python-warnings to rtems/docs/rtems-docs:main
Author:   Frank Kuehndel




## Summary

waf: Fix Python warnings

```
rtems-docs/common/waf.py:111: SyntaxWarning: invalid escape sequence '\D'
  ver = tuple(map(int, re.split('[\D]', version)))
rtems-docs/common/waf.py:118: SyntaxWarning: invalid escape sequence '\D'
  ver = tuple(map(int, re.split('[\D]', version)))
rtems-docs/common/waf.py:418: SyntaxWarning: invalid escape sequence '\?'
  no_hash = re.sub(b'\?v=[a-z0-9]{8}', b'', fp.read())
rtems-docs/common/waf.py:419: SyntaxWarning: invalid escape sequence '\?'
  no_digest = re.sub(b'\?digest=[a-z0-9]{20}', b'', no_hash)
rtems-docs/common/latex.py:9: SyntaxWarning: invalid escape sequence '\d'
  '\documentclass[a4paper,11pt,english]{report}']
```

Basically, Python keeps wrong `\` but prints a warning. Using "raw" strings with `re` (regular expressions) is recommended.
What raises some doubts is the use of "binary" strings with `re`. Yet, these were already in the original code.

Close #58


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