Refactor error messages to lowercase and fix typos

[Jesserc]

Updated error messages to lowercase and fixed typos in code.

• Changed error messages to start with lowercase for better style (as per go-staticcheck ST1005).
• Fixed typos.

This makes the code easier to read and follows Go's best practices.

Affected file(s):

• All files in pkg/vm/memory/

Test result:

[Jesserc]

What do you guys think

@fmoletta

[fmoletta]

Looks good, thank you!

[codecov-commenter]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (e01d7a5) 57.48% compared to head (a97ec5d) 57.48%.

Files	Patch %	Lines
pkg/vm/memory/relocatable.go	60.00%	2 Missing ⚠️
pkg/vm/memory/memory.go	66.66%	0 Missing and 1 partial ⚠️
pkg/vm/memory/relocatable_err.go	0.00%	1 Missing ⚠️
pkg/vm/memory/segments.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #320   +/-   ##
=======================================
  Coverage   57.48%   57.48%           
=======================================
  Files          55       55           
  Lines        7145     7145           
=======================================
  Hits         4107     4107           
  Misses       2625     2625           
  Partials      413      413           

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