Fix docs.rs build

[alamb]

Which issue does this PR close?

Closes #1695

Rationale for this change

I broke docs.rs build by merging #1349 without testing it first (shame on me!)

What changes are included in this PR?

Fix the build by removing unneeded part of 1349

I tested this by temporarily publishing an ancient version of parquet to crates.io from this branch https://github.com/alamb/arrow-rs/tree/alamb/test_crates_publish and verifying the docs built correctly

You can see the results here:

• https://crates.io/crates/parquet/0.18.1
• https://docs.rs/parquet/0.18.1/parquet/

Are there any user-facing changes?

Docs will work correctly when published on crates.io

cc @HaoYang670 @viirya @tustvold

[codecov-commenter]

Codecov Report

Merging #1696 (e57d8d8) into master (101edc9) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1696      +/-   ##
==========================================
- Coverage   83.10%   83.09%   -0.01%     
==========================================
  Files         193      193              
  Lines       56011    56011              
==========================================
- Hits        46547    46545       -2     
- Misses       9464     9466       +2     

Impacted Files	Coverage Δ
parquet_derive/src/parquet_field.rs	65.75% <0.00%> (-0.46%)	⬇️
arrow/src/datatypes/datatype.rs	65.09% <0.00%> (-0.37%)	⬇️
parquet/src/encodings/encoding.rs	93.65% <0.00%> (+0.19%)	⬆️

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[alamb]

I plan to merge this when the test has completed

[HaoYang670]

Just a small nit in PR description:
Replace Closes # #1695 with Closes #1695

[alamb]

Thanks all