Add documentation for inline function patterns option for cmock

[Letme]

In default project.yml file we were missing the inline_function_patterns, which is usually crucial for when you have a custom inline function definition or macro. Since that is in CMock documentation and treat_inlines is by default to exclude I made sure I commented out the rest.

While at it I also fixed the typo in treat_externs and treat_inlines few lines above.

Closes #1092

[Letme]

I am not sure this is the only spot that needs fixing to allow changes to default project.yml generation, but it should provide a hint. I like most the tools that generate all available options with default values configuration to make it explicit which features are available.