Governance process been actualized. (#82736)

Changes:
* form for topics proposals for Core maintainers review been added
* merge_rules.json file specified as spruce of truth for the list of maintainers (since it is the file that actually defines permissions)
* responsibilities of the module maintainers are added (as per the last core maintainers meeting)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/82736
Approved by: https://github.com/svekars, https://github.com/soumith
diff --git a/docs/source/community/governance.rst b/docs/source/community/governance.rst
index 0a7c224..9e9c162 100644
--- a/docs/source/community/governance.rst
+++ b/docs/source/community/governance.rst
@@ -70,8 +70,15 @@
 `pytorch/pytorch <https://github.com/pytorch/pytorch>`__ where
 they are responsible for a folder).
 
+Responsibilities of the maintainer includes:
+* Triaging high priority issues of the module
+* Triaging and reviewing and landing high priority pull requests of the module
+* Supporting public documentation related to the module
+* Running public developer meetings
+
 Core Maintainers
 ----------------
+
 The core maintainers are expected to have a deep understanding
 of the PyTorch code base and design philosophies. Their responsibilities
 include:
@@ -130,14 +137,12 @@
 The Process for Nomination
 ~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-* We will have a nomination form, where anyone in the community can
-  nominate a person to a Module maintainer position
-* Every 3 months, the core maintainers go through the nominations,
-  do light filtering around spam or desk-rejection, and draw up a
-  list of potential nominees.
-* The core maintainers ask the specific module maintainers for more
-  information on the nominee. The information should include the following
-  items:
+* Each module has its own process. Please contact module maintainers for more information.
+  However, if there is no process identified, you can file a request to the core maintainers
+  by submitting [this form](https://forms.gle/xNeu1byGMZVHcA2q7). Core maintainers are
+  meeting every three months.
+* If you are submitting a request to the core maintainers, the information in your request
+  must include the following items:
 
   * The nominees depth and breadth of code, review and design
     contributions on the module