timer: fixes and improvements

[Maria-12648430]

The first commit in this PR fixes two inconsistencies:

• When timer:send_after(0, PidOrRegName, Msg) was used and PidOrRegName was an atom which was not registered at the time of the call, a badarg exception was raised instead of returning {error, badarg} like everywhere else
• When timer:send_after(Time, Pid, Msg) was used, where Pid was a local pid and Time would exceed the erlang:start_timer interval (see here), a badarg exception was raised instead of returning {error, badarg} like everywhere else

It also optimizes two timer:send_after cases:

• timer:send_after(Time, RegName, Msg) (where RegName is a locally registered name) has been changed to use erlang:send_after directly and not go through the timer server process
• timer:send_after(Time, {RegName, Node}, Msg) (where RegName a registered name at node Node, and Node is the local node) has been changed to use erlang:send_after directly and not go through the timer server process

The second commit in this PR contains documentation fixes and rewordings in order to read more modern.

[github-actions]

CT Test Results

    2 files    100 suites   1h 7m 18s ⏱️
2 299 tests 2 247 ✅ 52 💤 0 ❌
2 718 runs  2 662 ✅ 56 💤 0 ❌

Results for commit 7e4a3c5.

♻️ This comment has been updated with latest results.

To speed up review, make sure that you have read Contributing to Erlang/OTP and that all checks pass.

See the TESTING and DEVELOPMENT HowTo guides for details about how to run test locally.

Artifacts

• Complete CT logs (Download Logs)
• HTML Documentation (Download HTML Docs)
• No Windows Installer found

// Erlang/OTP Github Action Bot