docs: add {arrowleft} and {arrowright} special characters #486
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What:
Documenting the new
{arrowleft}
and{arrowright}
special characters introduced in #404.Why:
The feature was released in 12.2.0 but not documented. This PR fixes it.
How:
I added the new special characters to the README. Since they're not meta characters, I added them before the list of meta characters instead of at the end of the list, for proper grouping.
Checklist: