Correct some typos

[goggle]

Corrects some typos in the repository.

[codecov]

Codecov Report

Patch coverage: 83.33% and no project coverage change.

Comparison is base (30dd578) 84.04% compared to head (e98bb17) 84.04%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #469   +/-   ##
=======================================
  Coverage   84.04%   84.04%           
=======================================
  Files          31       31           
  Lines        4142     4142           
=======================================
  Hits         3481     3481           
  Misses        661      661           

Impacted Files	Coverage Δ
src/attributes.jl	89.65% <ø> (ø)
src/compression.jl	89.90% <ø> (ø)
src/data/custom_serialization.jl	92.00% <ø> (ø)
src/data/writing_datatypes.jl	96.84% <ø> (ø)
src/inlineunion.jl	93.33% <ø> (ø)
src/loadsave.jl	95.65% <ø> (ø)
src/object_headers.jl	38.37% <0.00%> (ø)
src/superblock.jl	96.77% <100.00%> (ø)

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