governance: soften time comittment language (envoyproxy#1978)

Signed-off-by: Matt Klein <[email protected]>

GOVERNANCE.md

@@ -3,19 +3,20 @@
 ## Your organization is not yet a committer
 
 * Express interest to the senior committers that your organization is interested in becoming a
-  committer. Becoming a committer generally means that you are going to be working close to full
-  time on Envoy for the foreseeable future. You should have domain expertise and be extremely
+  committer. Becoming a committer generally means that you are going to be spending substantial
+  time (>25%) on Envoy for the foreseeable future. You should have domain expertise and be extremely
   proficient in C++. Ultimately your goal is to become a senior committer that will represent your
   organization.
 * We will expect you to start contributing increasingly complicated PRs, under the guidance
   of the existing senior committers.
 * We may ask you to do some PRs from our backlog.
 * As you gain experience with the code base and our standards, we will ask you to do code reviews
-  for incoming PRs.
+  for incoming PRs (i.e., all committers are expected to shoulder a proportional share of
+  community reviews).
 * After a period of approximately 2-3 months of working together and making sure we see eye to eye,
   the existing senior committers will confer and decide whether to grant commit status or not. We
-  make no guarantees on the length of time this will take, but 2-3 months of full time work is
-  the approximate goal.
+  make no guarantees on the length of time this will take, but 2-3 months is the approximate
+  goal.
 
 ## Your organization is currently a committer