Fix typos

Change-Id: I7365a0194ef09107c8dc6fe2c15309f4607f2d8c
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/210222
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
Tested-by: Jenkins

xmlsecurity/source/helper/xsecctl.cxx

@@ -435,7 +435,7 @@ void XSecController::startMission(const rtl::Reference<UriBindingHelper>& xUriBi
  *  get ready for a new mission.
  *
  *   INPUTS
- *  xUriBinding       - the Uri binding that provide maps between uris and
+ *  xUriBinding       - the Uri binding that provides maps between uris and
  *                          XInputStreams
  *  xSecurityContext  - the security context component which can provide
  *                      cryptoken
@@ -499,7 +499,7 @@ void XSecController::endMission()
     {
         if ( m_eStatusOfSecurityComponents == InitializationState::INITIALIZED )
         /*
-         * ResolvedListener only exist when the security components are created.
+         * ResolvedListener only exists when the security components are created.
          */
         {
             css::uno::Reference< css::xml::crypto::sax::XMissionTaker > xMissionTaker

xmlsecurity/source/xmlsec/nss/secerror.cxx

@@ -41,7 +41,7 @@ const ErrDesc allDesc[] = {
 
 
 /* Returns a UTF-8 encoded constant error string for "errNum".
- * Returns NULL if errNum is unknown.
+ * Returns an empty string if errNum is unknown.
  */
 const char *
 getCertError(PRErrorCode errNum)