coreutils*: use short more info links

[vladimyr]

• The page (if new), does not already exist in the repo.
• The page is in the correct platform directory (common/, linux/, etc.)
• The page has 8 or fewer examples.
• The PR title conforms to the recommended templates.
• The page follows the content guidelines.
• The page description includes a link to documentation or a homepage (if applicable).

GNU online documentation provides user-friendly URLs - for example, https://www.gnu.org/software/coreutils/ls which redirects to https://www.gnu.org/software/coreutils/manual/html_node/ls-invocation.html#ls-invocation. Those short forms are advertised through coreutils manpages (for example, ls) so I've updated all accompanying coreutils tldr pages to follow the suit.

This is done using following script:

rg -l 'gnu.org/software/coreutils/manual/html_node/(.*?)-invocation.html' |
    xargs sed -i -E 's|(gnu.org/software/coreutils)/manual/html_node/(.*?)-invocation.html|\1/\2|g'

[tansiret]

LGTM.

[bl-ue]

Wow, really cool!

[vladimyr]

Thanks, I'd do anything to have shorter URLs not spanning multiple lines in my terminal 😀