Typo fix: _NoHostExtenY -> _NoHostExtendY (#6687)

imgui_tables.cpp

@@ -82,7 +82,7 @@ Index of this file:
 //   Y with ScrollX/ScrollY disabled: we output table directly in current window
 //   - outer_size.y  < 0.0f  ->  Bottom-align (but will auto extend, unless _NoHostExtendY is set). Not meaningful if parent window can vertically scroll.
 //   - outer_size.y  = 0.0f  ->  No minimum height (but will auto extend, unless _NoHostExtendY is set)
-//   - outer_size.y  > 0.0f  ->  Set Minimum height (but will auto extend, unless _NoHostExtenY is set)
+//   - outer_size.y  > 0.0f  ->  Set Minimum height (but will auto extend, unless _NoHostExtendY is set)
 //   Y with ScrollX/ScrollY enabled: using a child window for scrolling
 //   - outer_size.y  < 0.0f  ->  Bottom-align. Not meaningful if parent window can vertically scroll.
 //   - outer_size.y  = 0.0f  ->  Bottom-align, consistent with BeginChild(). Not recommended unless table is last item in parent window.