Merge branch 'primes_congruences' of github.com:xcaruso/sage into primes_congruences

Author: Xavier Caruso

src/sage/sets/primes.py

@@ -559,7 +559,7 @@ def in_range(self, start, stop=None):
             sage: P.in_range(50, 100)
             [61, 67, 73, 79, 97]
 
-        When a unique integer is passed, it is interpreted as the
+        When a single integer is passed, it is interpreted as the
         upper bound::
 
             sage: P.in_range(50)
@@ -1016,8 +1016,7 @@ def is_subset(self, other, almost=False):
 
     def is_superset(self, other, almost=False):
         r"""
-        Return ``True`` if this set of is supset of ``other``;
-        ``False`` otherwise.
+        Return whether this set contains the set ``other`` as a subset.
 
         INPUT: