Symbol and format fix.

[poppinlp]

grunt.config.md

This Gruntfile really means "the Gruntfile", so use Gruntfile may be better? And there are many cases like this in other files e.g. grunt.file.md.

File paths are relative to the Gruntfile unless the current working directory is changed with grunt.file.setBase or the --base command-line option.

Change grunt's current working directory (CWD). By default, all file paths are relative to the Gruntfile.

grunt.util.md

Step 2 use colon to connect goal and method, so step 1 use it too may be better?