Added SteamDocs::param()

Allows a shorthand to generate HTML of a paramter type & optional flag.
SteamDocs::param() New line if type's too big.

If the Type string is too big and is optional, add a <br> between type
and optional text. Otherwise text gets truncated when too big.
ISteamHub -> General

* Added Common Outputs info.
* Added ID tags for Common Inputs/Outputs.
New: SeeInputs() & SeeOutputs

* Added SeeInputs() & SeeOutputs() for referencing the common fields.
* Fixed anchor ID for Common Outputs.
SteamDocs::param() BR fix

<br> should only be evalutated if optional is set to true.
Header fixes

Examples needed to be <h4>.
ISteamHub::GetAnnouncements First Draft!