Parenthesized optional scope in commit message structure

[Martín Sande Costa]

Commit message should be structured as per doc:

<type>[optional scope]: <description>

[optional body]

[optional footer(s)]

While these brackets are correctly indicating that said scope is to be optionally included, the specification is missing the mandatory parentheses that should surround the scope (if it exists). Maybe it can be included as:

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

[optional body]

[optional footer(s)]