Must reset the push docstring before regenerating it

[mih]

Otherwise the builddoc decorator will amend the existing pre-generated
docstring, effectively duplicating it.

[mih]

The test failure is non-specific to this PR -- also the mainline is failing right now.

[codecov]

Codecov Report

Merging #71 (7618392) into main (de5e4cb) will increase coverage by 6.42%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #71      +/-   ##
==========================================
+ Coverage   80.26%   86.69%   +6.42%     
==========================================
  Files          27       27              
  Lines        2103     2382     +279     
==========================================
+ Hits         1688     2065     +377     
+ Misses        415      317      -98     

Impacted Files	Coverage Δ
datalad_next/patches/push_to_export_remote.py	87.05% <100.00%> (+0.15%)	⬆️
datalad_next/_version.py	45.39% <0.00%> (-54.61%)	⬇️
datalad_next/utils.py	84.09% <0.00%> (+9.09%)	⬆️
datalad_next/gitremote/datalad_annex.py	89.38% <0.00%> (+69.27%)	⬆️

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