Remove any title attribute from the_shortlink()

[sabernhardt]

Option 1: Removes any title attribute from the shortlink output, and updates documentation.

Trac 62838

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Props sabernhardt, joedolson.

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[audrasjb]

Looks good to me. Only added a small enhancement proposal for the default value.

[audrasjb]

Alright thanks for the PR. Looks like we're good to go with the proposed implementation.

[audrasjb]

committed in https://core.trac.wordpress.org/changeset/59703