Document strings.FirstUpper

[deining]

This PR addresses #739 by adding a new documentation page for function strings.FirstUpper. It also fixes 2 typos I spotted.
One quirk I came across while previewing the new page locally:
In the frontmatter of the newly created page, relatedfuncs is empty. However, at be bottom of the page, there is a section See Also, containing entries for anchorize, strings.Repeat, errorf and warnf, float, and emojify. This is weird.

Additional note: to me it seems like the section See Also for existing functions string.xxx is often filled with somehow unrelated entries.

[jmooring]

Yes, relatedfuncs is, at the moment, apparently not used. It is not referenced anywhere in the templates or the theme.

The "See Also" bit is rendered by:
https://github.com/gohugoio/gohugoioTheme/blob/master/layouts/partials/related.html

Which is driven by:
https://github.com/gohugoio/hugoDocs/blob/master/config/_default/config.toml#L60-L70

[jmooring]

You can remove the following from front matter:

• date
• publishdate
• lastmod
• workson
• deprecated

And please remove the changes to the Firebase page. I'm working on that section now.

Thanks.

[deining]

Yes, relatedfuncs is, at the moment, apparently not used. It is not referenced anywhere in the templates or the theme.

Thanks for your clarification, this was helpful! What about adding an additional section Related functions on function pages? Alternatively, we could add any given related function(s) as additional items to the top of the list in the See also section.

You can remove the following from front matter:
* date
* publishdate
* lastmod
* workson
* deprecated

Done. I changed the archetype for function pages as well, I hope this is fine for you.

And please remove the changes to the Firebase page. I'm working on that section now.

Done.

Thanks.

You are welcome.