Fix typos [skip ci]

Author: ankane

test/shift_scheduling_sat_test.rb

@@ -44,7 +44,7 @@ def test_shift_scheduling_sat
     shift_constraints = [
       # One or two consecutive days of rest, this is a hard constraint.
       [0, 1, 1, 0, 2, 2, 0],
-      # betweem 2 and 3 consecutive days of night shifts, 1 and 4 are
+      # between 2 and 3 consecutive days of night shifts, 1 and 4 are
       # possible but penalized.
       [3, 1, 2, 20, 3, 4, 5]
     ]
@@ -68,7 +68,7 @@ def test_shift_scheduling_sat
       [3, 1, 0]
     ]
 
-    # daily demands for work shifts (morning, afternon, night) for each day
+    # daily demands for work shifts (morning, afternoon, night) for each day
     # of the week starting on Monday.
     weekly_cover_demands = [
       [2, 3, 1],  # Monday

test/support/shift_scheduling_sat.py

@@ -27,7 +27,7 @@
 
 
 def negated_bounded_span(works, start, length):
-    """Filters an isolated sub-sequence of variables assined to True.
+    """Filters an isolated sub-sequence of variables assigned to True.
 
   Extract the span of Boolean variables [start, start + length), negate them,
   and if there is variables to the left/right of this span, surround the span by
@@ -227,7 +227,7 @@ def solve_shift_scheduling(params, output_proto):
     shift_constraints = [
         # One or two consecutive days of rest, this is a hard constraint.
         (0, 1, 1, 0, 2, 2, 0),
-        # betweem 2 and 3 consecutive days of night shifts, 1 and 4 are
+        # between 2 and 3 consecutive days of night shifts, 1 and 4 are
         # possible but penalized.
         (3, 1, 2, 20, 3, 4, 5),
     ]
@@ -251,7 +251,7 @@ def solve_shift_scheduling(params, output_proto):
         (3, 1, 0),
     ]
 
-    # daily demands for work shifts (morning, afternon, night) for each day
+    # daily demands for work shifts (morning, afternoon, night) for each day
     # of the week starting on Monday.
     weekly_cover_demands = [
         (2, 3, 1),  # Monday