[docs][7.2] Documentation backports

[bmorelli25]

Backports the following documentation commits to 7.2:

• [docs] xpack security improvements from Beats ([docs] xpack security improvements from Beats #2228)
• [docs] ILM documentation ([docs] ILM documentation #2231)
• correct typo for word can cited as 'an' (correct typo for word can cited as 'an' #2263)
• [docs] Update redirect page for dashboards ([docs] Update redirect page for dashboards #2269)
• [docs] Fix APM on cloud bug ([docs] Fix APM on cloud bug #2270)
• docs: updated cmd docs ([docs] updated cmd docs #2299)