docs add skip_plot_matrix flag

docs/hicstuff_usage.md

@@ -234,6 +234,14 @@ Binsize for plotting matrix. Default: 10000
 --hicstuff_bin [binsize]
 ```
 
+### `--skip_plot_matrix`
+
+Do not plot matrices. Default: false
+
+```bash
+--skip_plot_matrix
+```
+
 > :warning: **Warning**: Depending of the size of your input, the bin size may not correspond and make the pipeline fail
 >>10000 is default for human genome.
 >>For yeast for example you may want to use a smaller bin

docs/usage.md

@@ -640,6 +640,14 @@ Do not call TADs. Default: false
 --skip_tads
 ```
 
+### `--skip_plot_matrix`
+
+Do not plot matrices. Default: false
+
+```bash
+--skip_plot_matrix
+```
+
 ### `--skip_multiQC`
 
 If defined, the MultiQC report is not generated. Default: false