mpl: update docs and fix tclint properly

Signed-off-by: Arthur Koucher <arthurkoucher@precisioninno.com>

Author: AcKoucher

src/mpl/README.md

@@ -47,6 +47,7 @@ rtl_macro_placer
     [-min_ar min_ar]
     [-report_directory report_directory]
     [-write_macro_placement file_name]
+    [-keep_clustering_data]
 ```
 
 #### Options
@@ -68,6 +69,7 @@ rtl_macro_placer
 | `-min_ar` | Specifies the minimum aspect ratio $a$, or the ratio of its width to height of a `StandardCellCluster` from $[a, \frac{1}{a}]$. The allowed values are floats, and the default value is `0.33`. |
 | `-report_directory` | Save reports to this directory. |
 | `-write_macro_placement` | Generates a file with the design's macro placement in the format of calls for the `place_macro` command. |
+| `-keep_clustering_data` | Save the hierarchy generated by MPL's clustering engine in the form of dbGroups inside ODB. |
 
 #### Simulated Annealing Weight parameters
 

src/mpl/test/keep_clustering_data.tcl

@@ -10,8 +10,8 @@ read_def testcases/io_constraints6.def
 
 set_thread_count 0
 rtl_macro_placer -keep_clustering_data \
-    -report_directory results/keep_clustering_data \
-    -halo_width 4.0
+  -report_directory results/keep_clustering_data \
+  -halo_width 4.0
 
 set def_file [make_result_file "keep_clustering_data.def"]
 write_def $def_file