Fixing some changelogs (Azure#27563)

* Updated versions for release

* Updated changelogs and readmes

* Minor changelog fixes

* Updated changelogs

* Fixed typos

Co-authored-by: vcolin7 <vicolina@microsoft.com>

Author: rickle-msft

sdk/storage/azure-storage-blob-changefeed/CHANGELOG.md

@@ -5,6 +5,7 @@
 ### Other Changes
 
 #### Dependency Updates
+
 - Updated blob dependency to 12.15.0
 
 ## 12.0.0-beta.16 (2022-02-11)

sdk/storage/azure-storage-blob-nio/CHANGELOG.md

@@ -22,7 +22,8 @@
 ### Other Changes
 - Enabling support for Files.exists() to support virtual directories required supporting virtual directories in reading file attributes. This required introducing a perf hit in the way of an extra getProps request
 
-### Dependency Updates
+#### Dependency Updates
+
 - Updated blob dependency to 12.15.0
 
 ## 12.0.0-beta.16 (2022-02-11)