Fix WFS3 overlapping text template

[elpaso]

Fixes: #42269

Candidate for immediate BP: it is a small HTML template change.

[pathmapper]

Looks good, thank you.

[elpaso]

@pathmapper did you know that you can easily customize and override the HTML templates? I'm not sure we documented that enough.

[pathmapper]

@elpaso not before I had a look at your PR :)

I think it's already well documented but I just didn't notice it:
https://docs.qgis.org/3.16/en/docs/server_manual/services.html#the-html-template-language

Having the word "Customize" in the title and thereby in the table of content on the left side of the docs page would be good.
Maybe change the existing title "The HTML template language" -> "Customize and override the HTML templates" ?

I could make a PR to the docs repo if wanted.

Edit: or just "Customize the HTML templates" to make it shorter.

Edit2: or "Customize the HTML pages"

[elpaso]

@pathmapper yes please, do whatever it takes to make it clearer.