Fix typos in xmlschemas{,types}.c

Signed-off-by: Jan Pokorný <jpokorny@redhat.com>
diff --git a/xmlschemastypes.c b/xmlschemastypes.c
index 8cc6bbd..03a55df 100644
--- a/xmlschemastypes.c
+++ b/xmlschemastypes.c
@@ -5648,7 +5648,7 @@
  * @val: the precomputed value
  * @retValue: the returned value
  *
- * Get a the cononical lexical representation of the value.
+ * Get the canonical lexical representation of the value.
  * The caller has to FREE the returned retValue.
  *
  * WARNING: Some value types are not supported yet, resulting
@@ -6070,7 +6070,7 @@
  * @retValue: the returned value
  * @ws: the whitespace type of the value
  *
- * Get a the cononical representation of the value.
+ * Get the canonical representation of the value.
  * The caller has to free the returned @retValue.
  *
  * Returns 0 if the value could be built, 1 if the value type is