Fix YARD docs

lib/mutant/mutation/evil.rb

@@ -30,9 +30,9 @@ module Mutant
         killer.killed?
       end
 
-      # Indicate if a killer should treat a kill as problematic.
+      # Indicate if a killer should treat a kill as problematic
       #
-      # @return [false] Killing evil mutants is not problematic.
+      # @return [false] Killing evil mutants is not problematic
       #
       # @api private
       #

lib/mutant/mutation/neutral.rb

@@ -10,12 +10,12 @@ module Mutant
 
         SYMBOL = 'noop'
 
-        # Indicate if a killer should treat a kill as problematic.
+        # Indicate if a killer should treat a kill as problematic
         #
         # @return [false] Killing noop mutants is a serious problem. Failures
         #   in noop may indicate a broken test suite, but they can also be an
         #   indication  mutant has altered the runtime environment in a subtle
-        #   way and tickled an odd bug.
+        #   way and tickled an odd bug
         #
         # @api private
         #
@@ -52,9 +52,9 @@ module Mutant
         !killer.killed?
       end
 
-      # Indicate if a killer should treat a kill as problematic.
+      # Indicate if a killer should treat a kill as problematic
       #
-      # @return [true] Neutral mutants must die.
+      # @return [true] Neutral mutants must die
       #
       # @api private
       #

lib/mutant/mutator/registry.rb

@@ -56,6 +56,8 @@ module Mutant
 
       # Assert the node type is valid
       #
+      # @return [undefined]
+      #
       # @raise [InvalidTypeError]
       #   raised when the node type is invalid
       #
@@ -70,6 +72,8 @@ module Mutant
 
       # Assert the node type is unique and not already registered
       #
+      # @return [undefined]
+      #
       # @raise [DuplcateTypeError]
       #   raised when the node type is a duplicate
       #