[Docs] API Syntax topic
[Docs] API Syntax topic

Edit handler usage, now <handlerType> <name>
and change formatting from <tt> to @code

Resolves: LE-5597
Change-Id: If5e7d7b97db32423836e12da06ff66e46f8920e6

legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af