Minor update

docs_2.0/manual_EN/3.quick-start/4.nebua-graph-crud.md

@@ -167,8 +167,8 @@ You can use the `INSERT` statement to insert vertices or edges based on existing
 * Insert vertices:
 
     ```nGQL
-    INSERT VERTEX <tag> (<property_name>[, <property_name>...])
-    [, <tag> (<property_name>[, <property_name>...]), ...]
+    INSERT VERTEX <tag_name> (<property_name>[, <property_name>...])
+    [, <tag_name> (<property_name>[, <property_name>...]), ...]
     {VALUES | VALUE} <vid>: (<property_value>[, <property_value>...])
     [, <vid>: (<property_value>[, <property_value>...];
     ```
@@ -178,7 +178,7 @@ You can use the `INSERT` statement to insert vertices or edges based on existing
 * Insert edges:
 
     ```nGQL
-    INSERT EDGE <edge type> (<property_name>[, <property_name>...])
+    INSERT EDGE <edge_type> (<property_name>[, <property_name>...])
     {VALUES | VALUE} <src_vid> -> <dst_vid>[@<rank>] : (<property_value>[, <property_value>...])
     [, <src_vid> -> <dst_vid>[@<rank> : (<property_name>[, <property_name>...]), ...]
     ```
@@ -272,7 +272,7 @@ You can use the statements [GO](TODO) [TODO], [FETCH](TODO) [TODO], and [LOOKUP]
 * `LOOKUP`
 
     ```nGQL
-    LOOKUP ON {<tag> | <edge_type>} WHERE <expression> [AND expression ...])]
+    LOOKUP ON {<tag_name> | <edge_type>} WHERE <expression> [AND expression ...])]
     [YIELD <return_list>]
     ```
 
@@ -385,14 +385,14 @@ UPDATE VERTEX <vid> SET <properties to be updated>
 * `UPDATE` edges:
 
 ```nGQL
-UPDATE EDGE <source vid> -> <destination vid> [@rank] OF <edge type> 
+UPDATE EDGE <source vid> -> <destination vid> [@rank] OF <edge_type> 
 SET <properties to be updated> [WHEN <condition>] [YIELD <columns to be output>]
 ```
 
 * `UPSERT` vertices or edges:
 
 ```nGQL
-UPSERT {VERTEX <vid> | EDGE <edge type>} SET <update_columns> 
+UPSERT {VERTEX <vid> | EDGE <edge_type>} SET <update_columns> 
 [WHEN <condition>] [YIELD <columns>]
 ```