docs: Update cpu_utilization_percent limit (#547)

- [ ] Regenerate this pull request now.

docs: Remove the limitation that all clusters in a CMEK instance must use the same key

PiperOrigin-RevId: 438385300

Source-Link: googleapis/googleapis@c59f02e

Source-Link: googleapis/googleapis-gen@04d03d1
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiMDRkMDNkMTdhYWZhN2I0NDIyZjczYzkzNjAwZjA0MDU0MjgxN2ZjZCJ9

Author: gcf-owl-bot[bot]

google/cloud/bigtable_admin_v2/types/instance.py

@@ -121,10 +121,10 @@ class AutoscalingTargets(proto.Message):
 
     Attributes:
         cpu_utilization_percent (int):
-            The cpu utilization that the Autoscaler
-            should be trying to achieve. This number is on a
-            scale from 0 (no utilization) to 100 (total
-            utilization).
+            The cpu utilization that the Autoscaler should be trying to
+            achieve. This number is on a scale from 0 (no utilization)
+            to 100 (total utilization), and is limited between 10 and
+            80, otherwise it will return INVALID_ARGUMENT error.
     """
 
     cpu_utilization_percent = proto.Field(
@@ -254,8 +254,6 @@ class EncryptionConfig(proto.Message):
                    key.
                 2) Only regional keys can be used and the region of the CMEK
                    key must match the region of the cluster.
-                3) All clusters within an instance must use the same CMEK
-                   key.
         """
 
         kms_key_name = proto.Field(