Code snippet rendering issue since markdeep 1.18

[SimonMarquis]

Markeep recent update broke the code snippets of this documentation.
To be more precise, this happend in version 1.18.
While undocumented, this breaking change actually enforces what the specs mentions:

Set off large blocks of code using equal-length strings of tilde ~ or back-tick ` characters.

Unfortunately, the documentation pages here are using a non-equal length, for example:

android-custom-lint-rules/docs/checks/AaptCrash.md.html

Lines 43 to 52 in ee6c2fa

	Here is an example of lint warnings produced by this check:
	~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~text
	res/values/aaptcrash.xml:5:Error: This construct can potentially crash
	aapt during a build. Change @+id/titlebar to @id/titlebar and define the
	id explicitly using <item type="id" name="titlebar"/> instead.
	[AaptCrash]
	&lt;item name="android:id"&gt;@+id/titlebar&lt;/item&gt;
	--------------------------------------------
	~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

It is as if it tries to use the same length, but including the language markers.

And this produces an erroneous output that can break the page rendering even more:

I'll prepare a PR to fix this globally.