Small tweaks to release notes.

Author: garydgregory

RELEASE_NOTES.txt

@@ -3,7 +3,7 @@ Release 5.5-beta1
 
 This is the first BETA release in the 5.5 release series that improves
 performance and robustness of connection pool implementations, further
-improves HTTP/2 specification conformance and introduces Jackson 2 JSON
+improves HTTP/2 specification conformance, and introduces Jackson 2 JSON
 message bindings.
 
 This release also includes all the fixes from the stable 5.4 branch.
@@ -14,7 +14,7 @@ Notable changes and features included in the 5.5 series:
 
 * HTTP message stream APIs and support for HTTP/2 message stream timeout.
 
-* SSLContexts to respect system properties by default.
+* SSLContexts respect system properties by default.
 
 * Cap pending HTTP/2 request commands per connection.
 
@@ -35,7 +35,7 @@ Compatibility notes:
 
 Change Log
 -------------------
-* Add deterministic, sleep-free connection pool fuzzer.
+* Add a deterministic, sleep-free connection pool fuzzer.
   Contributed by Arturo Bernal <abernal at apache.org>
 
 * Require Java 17 or newer to build HttpCore with Maven.