Stray "[" at the start of some code snippets in the manual

[chrism]

e.g.: ​https://postgis.net/docs/manual-dev/en/using_raster_dataman.html#idm24756

<![CDATA[ … ]]>

​https://developer.mozilla.org/en-US/docs/Web/API/CDATASection

Fix: ​https://github.com/postgis/postgis/pull/745

[strk]

Thanks Chris, it's preferred, in general, to first file the ticket, so you can reference it from the commit log. Too late for this one as it landed in official repo with [a396271bb6034b6b865504e4c0945d2cc1e8dc8b/git] already