Fix typo and add references on the 'Introduction to networking' page

[network-charles]

This PR resolves a spelling mistake on the "Introduction to networking" page.

"syncronises" should be "synchronises"

Relevant to canonical/open-documentation-academy#162

[s-makin]

Hi @network-charles, thank you for taking the time to submit this PR.

Because we use MyST-flavoured markdown, we are able to use the {ref}text <link> format to render internal documentation links. This is an advantage over the standard markdown approach of hard-coding links because if a page gets moved, the link does not get broken or need to be updated.

Could I ask you to please revert the changes you made to the link formatting as we don't want to include any hard-coded internal links (they are harder to maintain).

Thanks in advance!

[network-charles]

Thanks for the feedback, @s-makin. I will get familiar with MyST-flavoured markdown. Is it something like this?

[s-makin]

Thanks for making those changes @network-charles, well spotted on that spelling error! Thank you for helping to make the Server docs better :)

[network-charles]

It's a pleasure