Fine tune Rocky releasenotes

Removing the core count release note as it was included
already in 16.0.0

Adding mention of fixed bugs.

Depends-On: https://review.openstack.org/#/c/592645/
Change-Id: I5c8ab52c245e3914bd704fd726f5eb89df7aa7a3

releasenotes/notes/rocky-bugs-fixed-920f27a2705b0808.yaml

@@ -0,0 +1,13 @@
+---
+fixes:
+  - |
+    On top of testing and documentation fixes following bugs
+    were addressed
+
+    * Bug 1695299_: Support RFC1738 quoted chars in passwords
+    * Bug 1734832_: Fix unreachable 'ImageSizeLimitExceeded' exception in image-upload
+    * Bug 1765748_: Prepare for WebOb 1.8.1
+
+    .. _1695299: https://bugs.launchpad.net/glance/+bug/1695299
+    .. _1734832: https://bugs.launchpad.net/glance/+bug/1734832
+    .. _1765748: https://bugs.launchpad.net/glance/+bug/1765748

releasenotes/notes/rocky-rc-b0ea7628b7a74c96.yaml

@@ -21,13 +21,6 @@ prelude: |
     the image metadata is still not preserved in these cases, this provides a
     way to save the image data on accidental deletes.
 
-    Due to increasing core counts on modern servers Glance services started
-    consuming huge amounts of resources as the default was to spin up equal
-    amount of workers to logical CPUs seen on the host. This automatic scaling
-    was capped to 8 workers limiting the resources consumed. While each worker
-    can handle a pool of connections this limit should be sufficient for most
-    clouds. Large deployments should monitor their performance after upgrade.
-
     When using Interoperable Image Import workflow, the cloud operators can
     now enable automatic image conversion to desired format. When the plugin
     is enabled end-users do not have any input to its operation but their