Discover and fix new typos

[szepeviktor]

• upgrade typos
• fix variable names

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.79%. Comparing base (e024b4b) to head (c80ae03).
Report is 4 commits behind head on unstable.

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #1446      +/-   ##
============================================
- Coverage     70.82%   70.79%   -0.04%     
============================================
  Files           119      119              
  Lines         64691    64691              
============================================
- Hits          45818    45795      -23     
- Misses        18873    18896      +23     

Files with missing lines	Coverage Δ
src/geohash_helper.c	99.16% <ø> (ø)
src/server.c	87.46% <100.00%> (ø)
src/server.h	100.00% <ø> (ø)
src/zmalloc.c	82.74% <ø> (ø)

... and 13 files with indirect coverage changes

[madolson]

Nice! Thanks for this.

[szepeviktor]

Glad to contribute to Valkey.