Merge branch '322-doc-pandora-matching-cost' into 'master'

doc: fix typo with plugins' names

Closes #322

See merge request 3d/PandoraBox/pandora!281

docs/source/userguide/step_by_step/matching_cost.rst

@@ -47,7 +47,7 @@ Configuration and parameters
 .. csv-table::
 
     **Name**,**Description**,**Type**,**Default value**,**Available value**,**Required**
-    *matching_cost_method*,Similarity measure,string,,ssd sad census zncc  or mc_cnn if plugin_libsgm is installed,Yes
+    *matching_cost_method*,Similarity measure,string,,ssd sad census zncc  or mc_cnn if plugin_mccnn is installed,Yes
     *window_size*,Window size for similarity measure,int,5,Must be >0 and For "census" : {3 5},No
     *subpix*,Cost volume upsampling factor,int,1, {1 2 4},No
     *band*, Band value on which to calculate the correlation, str, None, band in left and right image's metadata,No