Add VCF module to docs and fixup docs warnings

[clintval]

Closes #72

Also fixes up all these warnings:

fgpyo/sam/builder.py:docstring of fgpyo.sam.builder.SamBuilder.add_pair:8: WARNING: Unexpected indentation.
fgpyo/sam/builder.py:docstring of fgpyo.sam.builder.SamBuilder.add_pair:9: WARNING: Bullet list ends without a blank line; unexpected unindent.
fgpyo/sam/builder.py:docstring of fgpyo.sam.builder.SamBuilder.add_pair:15: WARNING: Unexpected indentation.
fgpyo/sam/clipping.py:docstring of fgpyo.sam.clipping.ClippingInfo.query_bases_clipped:1: WARNING: duplicate object description of fgpyo.sam.clipping.ClippingInfo.query_bases_clipped, other instance in api, use :noindex: for one of them
fgpyo/sam/clipping.py:docstring of fgpyo.sam.clipping.ClippingInfo.ref_bases_clipped:1: WARNING: duplicate object description of fgpyo.sam.clipping.ClippingInfo.ref_bases_clipped, other instance in api, use :noindex: for one of them
fgpyo/fasta/builder.py:docstring of fgpyo.fasta.builder:11: WARNING: Unexpected indentation.
fgpyo/fasta/builder.py:docstring of fgpyo.fasta.builder:16: WARNING: Block quote ends without a blank line; unexpected unindent.
fgpyo/io/__init__.py:docstring of fgpyo.io.to_writer:9: WARNING: Block quote ends without a blank line; unexpected unindent.
fgpyo/util/inspect.py:docstring of fgpyo.util.inspect.attr_from:1: WARNING: duplicate object description of fgpyo.util.inspect.attr_from, other instance in api, use :noindex: for one of them

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (66b2200) 92.88% compared to head (b0f9ba7) 92.91%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #78      +/-   ##
==========================================
+ Coverage   92.88%   92.91%   +0.02%     
==========================================
  Files          30       30              
  Lines        3122     3134      +12     
  Branches      581      581              
==========================================
+ Hits         2900     2912      +12     
  Misses        148      148              
  Partials       74       74              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[nh13]

Thank-you for this! I've made a pre-built version here: https://fgpyo.readthedocs.io/en/cv_docs_fixup/

[clintval]

@nh13 I found a few more docs issues and pushed up a commit. I know there are still more rough edges, but perhaps we should merge this and I can make smaller docs PRs as I come across issues going forward.

[nh13]

lgtm, thank-you!