chore: fix typo in comments

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

Author: tnir

lib/rake/packagetask.rb

@@ -79,7 +79,7 @@ class PackageTask < TaskLib
     # Zip command for zipped archives.  The default is 'zip'.
     attr_accessor :zip_command
 
-    # True if parent directory should be omited (default is false)
+    # True if parent directory should be omitted (default is false)
     attr_accessor :without_parent_dir
 
     # Create a Package Task with the given name and version.  Use +:noversion+