More 3.12.11 release note type and grammar fixes

(cherry picked from commit b0c8f33)

Author: michaelklishin

release-notes/3.12.11.md

@@ -45,7 +45,7 @@ Release notes can be found on GitHub at [rabbitmq-server/release-notes](https://
  * Definition files that are virtual host-specific cannot be imported on boot. Such files will now be
    detected early and the import process will terminate after logging a more informative message.
 
-   Previous the import process would run into an obscure exception.
+   Previously the import process would run into an obscure exception.
 
    GitHub issues: [#10068](https://github.com/rabbitmq/rabbitmq-server/issues/10068), [#10085](https://github.com/rabbitmq/rabbitmq-server/pull/10085)
 
@@ -96,8 +96,8 @@ Release notes can be found on GitHub at [rabbitmq-server/release-notes](https://
 
 #### Bug Fixes
 
- * Certain CLI commands could not be performed in a shell script loop, unless the script explicitly
-   redirected standard input.
+ * Certain CLI commands could not be run in a shell script loop, unless the script explicitly
+    redirected standard input.
 
    GitHub issue: [#10131](https://github.com/rabbitmq/rabbitmq-server/pull/10131)
 
@@ -132,7 +132,8 @@ Release notes can be found on GitHub at [rabbitmq-server/release-notes](https://
 
 #### Enhancements
 
- * HTTP API endpoints that involve contacting multiple nodes 
+ * HTTP API endpoints that involves contacting multiple nodes now respond much quicker when a cluster node
+   has gone down, were shut down, or otherwise has become unreachable by the rest of the cluster
 
    GitHub issue: [#10123](https://github.com/rabbitmq/rabbitmq-server/pull/10123)