Fix typos in Reference Manual

[juhlig]

This PR fixes some typos and grammar issues, and also rewords some phrases for simplification and/or clarification, in the Reference Manual.

One thing we noticed while doing this (but didn't change) is that there are mixed usages of british and american english (eg "behaviour" vs "behavior"), usually in the prose. Also, there are some spellings that, while not wrong, have fallen out of favor (eg "run-time" vs "runtime").

This PR slightly clashes with #10914, bad timing... Whatever PR gets merged first, the other will probably have to be adapted.

[github-actions]

CT Test Results

  1 files   11 suites   3m 3s ⏱️
 95 tests  91 ✅ 4 💤 0 ❌
111 runs  107 ✅ 4 💤 0 ❌

Results for commit 83ce6b3.

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// Erlang/OTP Github Action Bot

[bjorng]

Overall looks good to me. I have a few suggestions for further improvements.

[bjorng]

Our policy is generally to use American spelling, but we have the -behaviour() attribute. Not sure that we should do this kind of changes now.

Because of the size of this pull request, do any changes as additional commits. I will ask you to squash later when I've reviewed the changes.

[Maria-12648430]

@bjorng I applied the suggestions which I think are indisputable and left the ones on which I have questions for later 😉

[juhlig]

Our policy is generally to use American spelling, but we have the -behaviour() attribute. Not sure that we should do this kind of changes now.

Not as part of this PR, I think.

Because of the size of this pull request, do any changes as additional commits. I will ask you to squash later when I've reviewed the changes.

Sure 👍

[juhlig]

@bjorng I applied your suggestions in the last commit.

[bjorng]

Thanks for your pull request.