[CMake] Patch for IF documentation.

[Brad King]

Miguel A. Figueroa-Villanueva wrote:
> I think the following documentation for the IF command:
> 
> <snip>
>         IF(variable1 OR variable2)
> 
>       True if either variable would be considered true individually.
> 
>         IF(COMMAND command-name)
> 
>       True if the given name is a file or directory.
> 
>         IF(EXISTS file-name)
>         IF(EXISTS directory-name)
> 
>       True if the given name is a directory.
> 
>         IF(IS_DIRECTORY directory-name)
> 
>       True if the named file or directory exists.
> 
>         IF(variable MATCHES regex)
>         IF(string MATCHES regex)
> 
>       True if the given string or variable's value matches the given 
> regular
>       expression.
> <snip>
> 
> should read something like:
> 
> <snip>
>         IF(variable1 OR variable2)
> 
>       True if either variable would be considered true individually.
> 
>         IF(COMMAND command-name)
> 
>       True if the given name is a command that can be invoked.
> 
>         IF(EXISTS file-name)
>         IF(EXISTS directory-name)
> 
>       True if the named file or directory exists.
> 
>         IF(IS_DIRECTORY directory-name)
> 
>       True if the given name is a directory.
> 
>         IF(variable MATCHES regex)
>         IF(string MATCHES regex)
> 
>       True if the given string or variable's value matches the given 
> regular
>       expression.
> <snip>
> 
> If this is correct, the attached file should work.

Thanks, I'll commit it.

-Brad