schema tree NEW lys_xpath_node function

Also some functions renamed and documentation
updated.
diff --git a/src/libyang.h b/src/libyang.h
index a9cfd2f..06e83a0 100644
--- a/src/libyang.h
+++ b/src/libyang.h
@@ -386,8 +386,8 @@
  *
  * Functions List (not assigned to above subsections)
  * --------------------------------------------------
- * - lyd_get_node()
- * - lyd_get_node2()
+ * - lyd_xpath_node()
+ * - lyd_find_node()
  */
 
 /**
@@ -569,8 +569,8 @@
  *
  * Internally, XPath evaluation is performed on \b when and \b must conditions in the schema. For that almost
  * a full XPath 1.0 evaluator was implemented. This XPath implementation is available on data trees by calling
- * lyd_get_node() except that only node sets are returned. This XPath conforms to the YANG specification
- * (RFC 6020 section 6.4). Some useful examples:
+ * lyd_xpath_node() and on schema trees by calling lys_xpath_node() except that only node sets are returned.
+ * This XPath conforms to the YANG specification (RFC 6020 section 6.4). Some useful examples:
  *
  * - get all top-level nodes of the __module-name__
  *
@@ -622,7 +622,8 @@
  *
  * Functions List
  * --------------
- * - lyd_get_node()
+ * - lyd_xpath_node()
+ * - lys_xpath_node()
  * - lyd_new_path()
  * - ly_ctx_get_node()
  * - ly_ctx_get_node2()