refine(mim/__init__.py): refine the comments

Author: ice-tong

mim/__init__.py

@@ -2,18 +2,18 @@
 
 # flake8: noqa
 
-####### Fix the mim command crashes due to requirements version conflict. ######
+###### Fix mim command crashes problem if requirements version conflict. #######
 # `pkg_resources` checks for a `__requires__` attribute in the `__main__` module
-# when initializing the default working set, and uses this to ensure a suitable
-# version of each affected distribution is activated.
+# when initializing the default working set, and resolves its dependency to
+# ensure a suitable version of each affected distribution is activated.
 #
 # The entry point scripts create by `setuptools` use the `__requires__` feature
 # for compatibility with `easy_install` but may cause mim crash when version
 # conflict exists.
 #
-# Hence, we here remove the `__requires__` declare in mim entry point script before
-# importing pkg_resources to handle this situation. This workaround works fine so
-# far, but not sure if it would cause other unknown problems or not.
+# To handle this situation, we set the `__requires__` declared in mim entry point
+# script from 'openmim' to '' before importing pkg_resources. This workaround works
+# fine so far, but not sure if it would cause other unknown problems or not.
 #
 # Related Links:
 # - https://github.com/open-mmlab/mim/issues/143