doc: Correction of a few typos in the release notes

Change-Id: Ie9e6e795eb8957b64b032476ed55d8c83c1abf02
Refs: #2812
diff --git a/docs/RELEASE_NOTES.rst b/docs/RELEASE_NOTES.rst
index 9dedfc4..10e9de4 100644
--- a/docs/RELEASE_NOTES.rst
+++ b/docs/RELEASE_NOTES.rst
@@ -95,7 +95,7 @@
   * ``dataBlock`` (use ``makeBinaryBlock``)
   * ``nestedBlock`` (use ``makeNestedBlock``)
 
-- The following methods of ``CommandOptions`` class, use ``setSigningInfo()`` instead (:refs:`2893`):
+- The following methods of ``CommandOptions`` class, use ``setSigningInfo()`` instead (:issue:`2893`):
 
   * ``CommandOptions::getSigningParamsKind``
   * ``CommandOptions::getSigningIdentity``
@@ -518,7 +518,7 @@
 
 - **Security**
 
-  + Add ``type dir`` :ref:`trust-anchor in ValidatorConfig <validator-conf-trust-anchors>`
+  + Add ``type dir`` :ref:`trust-anchor in ValidatorConfig <validator-conf-trust-anchors>`_
     to add all certificates under the specified directory as trust anchors.
     The new option also allow periodic reloading trust anchors, allowing dynamic trust
     models.