Refine commit message format grammar

[1e9y]

Current suggested format doesn't clearly state correct usage of optional scope. Commit header defined as following:

<type>[optional scope]: <description>

While later in text scope is defined as "contextual information and is contained within parenthesis". That means commit header should have following form:

<type>[(<scope>)]: <description>

Square brackets here means optional block. Parenthesis are literal symbols. <scope> is an arbitrary string.

[malware2101]

can you assign me this!!

[bcoe]

@malware2101 please go ahead and submit a PR 👍