Fix various misspelled words

[jamesjer]

Why:

Because words should be spelled correctly.

What's being changed (if available, include any code snippets, screenshots, or gifs):

Misspelled words are changed to be spelled correctly (mostly correcting premable to preamble).

Check off the following:

• [N/A] I have added the necessary functions to implement my fix in a structured, readable way.
• [N/A] I have documented my added code to the codebase, added new directories to makedoc.g and new chapters/sections to order_info.g.
• [N/A] I have tested my additions, and included the tests within the tst directory.
• [N/A] I have summarised any large features as bullet points in CHANGELOG.md.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.02%. Comparing base (ef849bd) to head (b3b311b).
⚠️ Report is 22 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #41      +/-   ##
==========================================
- Coverage   87.86%   87.02%   -0.84%     
==========================================
  Files          12       12              
  Lines         890      848      -42     
==========================================
- Hits          782      738      -44     
- Misses        108      110       +2     

Files with missing lines	Coverage Δ
gap/latex/digraphs.gi	100.00% <100.00%> (ø)
gap/latex/latex.gi	95.49% <100.00%> (-0.23%)	⬇️
gap/latex/structdesc.gi	96.87% <100.00%> (-0.10%)	⬇️
gap/typeset.gd	100.00% <ø> (ø)
gap/typeset.gi	91.66% <ø> (-0.44%)	⬇️

... and 2 files with indirect coverage changes

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[olexandr-konovalov]

@jamesjer many thanks!

[olexandr-konovalov]

@ZachNewbery This repository is configured to allow only squash and merge - are you happy for me to change settings? For this kind of change, rebase and merge seems better, but I can't do it.

[ZachNewbery]

Yep sure @olexandr-konovalov, was mostly set to squash and merge to avoid adding to long a commit chain for more complex PRs.