Change the ecotag doc according to the new -M option

doc/sphinx/source/scripts/ecotag.rst

@@ -15,7 +15,7 @@
         output file. FLOAT is included in a [0,1] interval.
 
    .. cmdoption::    --minimum-circle=FLOAT
-   
+
         minimum identity considered for the assignment circle.
         FLOAT is included in a [0,1] interval.
 
@@ -40,11 +40,20 @@
    .. cmdoption::  -E FLOAT, --errors=FLOAT
 
         FLOAT is the fraction of reference sequences that will
-        be ignored when looking for the most recent common ancestor. This
+        be ignored when looking for the lowest common ancestor. This
         option is useful when a non-negligible proportion of reference sequences
         is expected to be assigned to the wrong taxon, for example because of
         taxonomic misidentification. FLOAT is included in a [0,1] interval.
 
+
+   .. cmdoption::  -M INTEGER, --min-matches=FLOAT
+
+        Define the minimum congruent assignation. If this minimum is reached and
+        the -E option is activated, the lowest common ancestor algorithm tolarated
+        that some sequences do not provide the same taxonomic annotation (see the
+        -E option).
+
+
    .. cmdoption::  --cache-size=INTEGER
 
         A cache for computed similarities is maintained by `ecotag`. the default