[rustdoc]: Explain what ESC does in the help box

[tesuji]

I think we could include a text to explain what ESC does after #82234 merged.

This helps increasing popularity of the feature. Also, should we need to tag relnotes for the above PR ?

[jyn514]

Mentoring instructions: Add an entry for esc in

rust/src/librustdoc/html/static/main.js

Lines 2906 to 2916 in 6b56603

	var shortcuts = [
	["?", "Show this help dialog"],
	["S", "Focus the search field"],
	["T", "Focus the theme picker menu"],
	["↑", "Move up in search results"],
	["↓", "Move down in search results"],
	["ctrl + ↑ / ↓", "Switch result tab"],
	["⏎", "Go to active search result"],
	["+", "Expand all sections"],
	["-", "Collapse all sections"],
	].map(function(x) {

[TaKO8Ki]

I'm interested in working on this issue!
@rustbot claim

[TaKO8Ki]

close this issue because esc doesn't do anything out of the ordinary. ref #82522 (comment)

[TaKO8Ki]

@jyn514
Could you close this issue?