Fix typos in relaxng.c

Signed-off-by: Jan Pokorný <jpokorny@redhat.com>
diff --git a/relaxng.c b/relaxng.c
index 2bbecd5..f34dc14 100644
--- a/relaxng.c
+++ b/relaxng.c
@@ -6600,7 +6600,7 @@
     }
 
     /*
-     * Apply 4.17 mergingd rules to defines and starts
+     * Apply 4.17 merging rules to defines and starts
      */
     xmlRelaxNGCombineStart(ctxt, ret);
     if (ret->defs != NULL) {
@@ -7314,7 +7314,7 @@
                     }
                 }
                 /*
-                 * Thisd is not an else since "include" is transformed
+                 * This is not an else since "include" is transformed
                  * into a div
                  */
                 if (xmlStrEqual(cur->name, BAD_CAST "div")) {