Update ChangeLog.d/pkg-config-files-addition.txt

Fix syntax errors in Changelog (and tidy up punctuation)

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/ChangeLog.d/pkg-config-files-addition.txt b/ChangeLog.d/pkg-config-files-addition.txt
index e39f62e..e459470 100644
--- a/ChangeLog.d/pkg-config-files-addition.txt
+++ b/ChangeLog.d/pkg-config-files-addition.txt
@@ -1,2 +1,4 @@
 Features
-    * Add pc files for pkg-config. eg.) pkg-config --cflags --libs (mbedtls|mbedcrypto|mbedx509)
+   * Add pc files for pkg-config, e.g.:
+     pkg-config --cflags --libs (mbedtls|mbedcrypto|mbedx509)
+