Add database table page; fix broken link

[nielsenjared]

This PR refers to canonical/open-documentation-academy#78

It adds the missing "Renaming a database table" and fixes the corresponding link in live-patching.rst. I put the file in the how-to directory. Let me know if it needs to be placed in another directory and if it needs to be added to an index.rst to address the toctree error.

[jugmac00]

@nielsenjared Could you please look into the build failures? It looks like the newly added page adds some spelling errors.

Thank you!

[jugmac00]

Also, please add the newly added file to the appropriate index.rst. Thank you!

[alvaro-crespo]

Thanks for the help @nielsenjared ! Changes look good to me. I've just fixed the reference link adding again ../ and then changed the format of the missing page to show it in sql code format (fyi this is done with ..code-block: sql).