docs: remove MACRO_HALO, replaced by MACRO_HALO_X/Y

Signed-off-by: Øyvind Harboe <[email protected]>

Author: oharboe

docs/user/FlowVariables.md

@@ -134,7 +134,6 @@ Note:
 | `PLACE_SITE`          | Placement site for core cells defined in the technology LEF file.                                                                                                                |
 | `TAPCELL_TCL`         | Path to Endcap and Welltie cells file.                                                                                                                                           |
 | `RTLMP_FLOW`          | 1 to enable the Hierarchical RTLMP flow, default empty |
-| `MACRO_HALO`          | Specifies keep out distance from macro, in X and Y, to standard cell row.                                                                                                        |
 | `MACRO_PLACEMENT`     | Specifies the path of a file on how to place certain macros manually using read_macro_placement.                                                                                 |
 | `MACRO_PLACEMENT_TCL` | Specifies the path of a TCL file on how to place certain macros manually.                                                                                                        |
 | `MACRO_PLACE_HALO`    | horizontal/vertical halo around macros (microns). Used by automatic macro placement.                                                                               |