Restore doctests in mockhttp.py

[Copilot]

Doctests were inadvertently removed from three methods in mocket/mocks/mockhttp.py when adding type hints and docstrings. This restores them while preserving the new annotations and structured docstrings.

Restored doctests

• Response.set_extra_headers – verifies header count and value after adding extra headers
• Entry.can_handle – verifies query string matching behavior (partial vs. full match)
• Entry._parse_requestline – verifies request line parsing and ValueError on invalid input

>>> Entry._parse_requestline('GET / HTTP/1.0') == ('GET', '/', '1.0')
True
>>> Entry._parse_requestline('Im not a RequestLine')
Traceback (most recent call last):
    ...
ValueError: Not a Request-Line

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.06%. Comparing base (a9ad9f5) to head (a2029a9).
⚠️ Report is 8 commits behind head on typehints-and-docstrings.

Additional details and impacted files

@@                    Coverage Diff                    @@
##           typehints-and-docstrings     #318   +/-   ##
=========================================================
  Coverage                     99.06%   99.06%           
=========================================================
  Files                            22       22           
  Lines                          1074     1074           
=========================================================
  Hits                           1064     1064           
  Misses                           10       10           

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