Use consistent spelling

[AlekSi]

Description

Speling is importent.

Readiness checklist

• I added/updated unit tests (and they pass).
• I added/updated integration/compatibility tests (and they pass).
• I added/updated comments and checked rendering.
• I made spot refactorings.
• I updated user documentation.
• I ran task all, and it passed.
• I ensured that PR title is good enough for the changelog.
• (for maintainers only) I set Reviewers (@FerretDB/core), Milestone (Next), Labels, Project and project's Sprint fields.
• I marked all done items in this checklist.

[codecov]

Codecov Report

Merging #3365 (f10c860) into main (8c9b681) will decrease coverage by 0.96%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #3365      +/-   ##
==========================================
- Coverage   74.10%   73.15%   -0.96%     
==========================================
  Files         413      413              
  Lines       25315    25315              
==========================================
- Hits        18760    18519     -241     
- Misses       5467     5680     +213     
- Partials     1088     1116      +28     

Files Changed	Coverage
internal/handlers/pg/msg_aggregate.go	100.00%
internal/handlers/pg/msg_find.go	100.00%

Flag	Coverage Δ
hana-1	?
hana-2	?
hana-3	?
integration	70.01% <100.00%> (-1.18%)	⬇️
mongodb-1	4.72% <0.00%> (ø)
pg-1	43.81% <100.00%> (ø)
pg-2	43.54% <100.00%> (-0.04%)	⬇️
pg-3	?
sqlite-1	42.72% <0.00%> (+0.05%)	⬆️
sqlite-2	42.11% <0.00%> (ø)
sqlite-3	42.96% <0.00%> (-0.11%)	⬇️
unit	23.05% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

[rumyantseva]

"English is important but engineering is importanter!" :D

[chilagrow]

Good point!