MINOR: Improve Docs Readability

[ryanrussell]

Signed-off-by: Ryan Russell git@ryanrussell.org

Closes #2695

Are there any user-facing changes?

No

[codecov-commenter]

Codecov Report

Merging #2696 (ec4b998) into master (1152c14) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2696      +/-   ##
==========================================
- Coverage   84.70%   84.67%   -0.04%     
==========================================
  Files         270      270              
  Lines       47059    46911     -148     
==========================================
- Hits        39861    39721     -140     
+ Misses       7198     7190       -8     

Impacted Files	Coverage Δ
datafusion/core/src/execution/memory_manager.rs	70.25% <0.00%> (-0.63%)	⬇️
datafusion/core/src/catalog/schema.rs	85.00% <0.00%> (-0.49%)	⬇️
...e/src/physical_optimizer/hash_build_probe_order.rs	89.04% <0.00%> (-0.23%)	⬇️
datafusion/core/tests/custom_sources.rs	83.72% <0.00%> (-0.19%)	⬇️
datafusion/core/tests/sql/json.rs	46.87% <0.00%> (-0.19%)	⬇️
datafusion/core/tests/sql/create_drop.rs	95.29% <0.00%> (-0.17%)	⬇️
datafusion/core/tests/sql/information_schema.rs	98.28% <0.00%> (-0.16%)	⬇️
...e/src/physical_plan/sorts/sort_preserving_merge.rs	92.57% <0.00%> (-0.15%)	⬇️
datafusion/core/src/execution/context.rs	78.64% <0.00%> (-0.14%)	⬇️
datafusion/core/src/physical_plan/cross_join.rs	89.94% <0.00%> (-0.12%)	⬇️
... and 24 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1152c14...ec4b998. Read the comment docs.