[DOC] Tweak "Timezone Objects"

	- Make method descriptions plain pragraphs in each method.
	- Make "Argument" and "Returns" note-lists.

	[Bug #20951] [DOC] About UTC offset calculation after `utc_to_local`

	[Bug #20951] [DOC] About UTC offset calculation after `utc_to_local`

[Bug #20585]

This was changed in 36a06efdd9f0604093dccbaf96d4e2cb17874dc8 because
`String.new(1024)` would end up allocating `1025` bytes, but the problem
with this change is that the caller may be trying to right size a String.

So instead, we should just better document the behavior of `capacity:`.

Co-authored-by: Jean Boussier <jean.boussier@gmail.com>

* Update reline-0.5.7

* Update irb-1.13.1

* YJIT: reduce default exec mem size to 48MiB based

Based on user feedback from @jhawthorn and others.
Better for small and memory-constrained deployments.

NOTE: This commit should be included in the next Ruby 3.3.x point
release. @xrxr should we tag someone specific?

* YJIT: Update yjit.md about mem size (#9687)

---------

Co-authored-by: Takashi Kokubun <takashikkbn@gmail.com>

  These are intentional words

(https://github.com/ruby/irb/pull/812)

* Change indexes.rdoc to indexes.md

* Change indexes.rdoc to indexes.md

* Change indexes.rdoc to indexes.md

https://github.com/ruby/irb/commit/b1cd53cbf7