doc: fix policy-library sshd anchor link & title

[tico88612]

Description

Fix Policy Library networking ssh anchor link

Changelog

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[mtardy]

Thank you! The policy library is lacking some care I think, so thanks for that!

[mtardy]

Mmh checkpatch see some issues on your commit description, maybe that's just a missing line between the title and sign-off, maybe that's because you are using a temporary email address, not sure. If you can modify that with git commit --amend, thank you! :)

Error: ERROR:BAD_SIGN_OFF: Unrecognized email address: 'ChengHao Yang'
  #6: 
  Signed-off-by: ChengHao Yang
  
  Error: ERROR:NO_AUTHOR_SIGN_OFF: Missing Signed-off-by: line by nominal patch author 'ChengHao Yang <17496418+tico886[12](https://github.com/cilium/tetragon/actions/runs/14745596024/job/41408886503?pr=3678#step:4:13)@users.noreply.github.com>'

[tico88612]

@mtardy I think it's have extra newline cause parser error, could you help me approve workflows again? Thanks!