Doc: edit qtcreatorcdbext docs

Fix capitalization, use standard wording, and
fix some QDoc commands.

Change-Id: Ic2e6cfd43b9aa24d69b2703334c3dc6fb2331299
Reviewed-by: hjk <hjk121@nokiamail.com>
Doc: edit utils docs

Use \a for all attributes in function descriptions
to avoid QDoc errors. Do not use \param, because
it is not a valid QDoc command.

Do not use \returns as it does not exist.

Do not use \brief for functions. It is not obligatory, so
rather than add them for all functions, let's consistenly leave them out.

Fix typos, grammar and style issues, and punctuation.

Change-Id: Ib8f296f93976265bb93dbeab40c5b47156518122
Reviewed-by: hjk <hjk121@nokiamail.com>
Doc: edit debugger API docs

Remove \brief commands from function descriptions.
Use QDoc commands for notes and lists.
Write GDB in all caps.
Fix punctuation and style and grammar issues.

Change-Id: I7f5bf0f53ad643eb4e2981c0d4e39c453dff5558
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>