Doc comment improvements

Signed-off-by: Madhura Jayaratne <madhura.cj@gmail.com>
Translated using Weblate (Afrikaans)

Currently translated at 12.0% (331 of 2749)
Translated using Weblate (Bengali)

Currently translated at 90.6% (2492 of 2749)
Translated using Weblate (Kurdish Sorani)

Currently translated at 19.2% (530 of 2749)
Translated using Weblate (Malay)

Currently translated at 13.7% (378 of 2749)
Translated using Weblate (Telugu)

Currently translated at 12.1% (335 of 2749)
Merge remote-tracking branch 'origin/QA_4_1' into QA_4_1
Translated using Weblate (Kazakh)

Currently translated at 12.5% (345 of 2749)
bug #4212 Table "disappears" if it has the same name as its tablegroup
Merge branch 'QA_4_1' of github.com:phpmyadmin/phpmyadmin into QA_4_1
Merge branch 'master' of github.com:phpmyadmin/phpmyadmin
Merge branch 'QA_4_1'