Documentation improvements.

[waywardmonkeys]

Fix some linking, some grammar, some typos, etc.

[codecov-commenter]

Codecov Report

Merging #1524 (6a88ac3) into main (1a2ba70) will not change coverage.
The diff coverage is 50.00%.

@@           Coverage Diff           @@
##             main    #1524   +/-   ##
=======================================
  Coverage   93.81%   93.81%           
=======================================
  Files         247      247           
  Lines       45839    45839           
=======================================
  Hits        43002    43002           
  Misses       2837     2837           

Impacted Files	Coverage Δ
common/src/lib.rs	89.33% <ø> (ø)
common/src/writer.rs	94.11% <ø> (ø)
query-grammar/src/query_grammar.rs	99.67% <ø> (ø)
src/collector/facet_collector.rs	98.00% <ø> (ø)
src/collector/mod.rs	48.21% <ø> (ø)
src/core/searcher.rs	77.93% <ø> (ø)
src/directory/directory.rs	90.14% <ø> (ø)
src/directory/directory_lock.rs	88.88% <ø> (ø)
src/directory/mmap_directory.rs	91.08% <ø> (ø)
src/directory/ram_directory.rs	88.81% <ø> (ø)
... and 10 more

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[waywardmonkeys]

Force updated to fix the formatting check failure.

[PSeitz]

Nice, thanks!