More cosmetic fixes for upcoming Clippy lints.

[adamreichold]

There are still some missing docs in the fastfield_codecs crate and Clippy will go nuts about uninlined-format-args if that ever reaches a stable version, but this should already make for a smaller diff before the next Clippy release.

[codecov-commenter]

Codecov Report

Merging #1771 (e6e7b5f) into main (7a8fce0) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1771      +/-   ##
==========================================
- Coverage   94.12%   94.11%   -0.01%     
==========================================
  Files         282      282              
  Lines       52908    52873      -35     
==========================================
- Hits        49798    49763      -35     
  Misses       3110     3110              

Impacted Files	Coverage Δ
src/lib.rs	96.04% <ø> (ø)
src/aggregation/mod.rs	98.84% <100.00%> (-0.04%)	⬇️
src/fastfield/alive_bitset.rs	99.31% <100.00%> (ø)
src/fastfield/multivalued/mod.rs	98.45% <100.00%> (ø)
src/postings/mod.rs	98.57% <100.00%> (ø)
src/query/range_query/range_query_ip_fastfield.rs	97.00% <100.00%> (-0.01%)	⬇️
src/query/range_query/range_query_u64_fastfield.rs	96.56% <100.00%> (-0.01%)	⬇️
sstable/src/block_reader.rs	73.77% <0.00%> (-1.64%)	⬇️
fastfield_codecs/src/null_index/sparse.rs	95.46% <0.00%> (+0.18%)	⬆️

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