used some plain apostrophes in source file comments

Author: paulk-asert

src/spec/test-resources/methodnotfound.groovy

@@ -22,12 +22,12 @@ methodNotFound { receiver, name, argList, argTypes, call ->
     // name is the name of the called method
     // argList is the list of arguments the method was called with
     // argTypes is the array of inferred types for each argument
-    // call is the method call for which we couldn’t find a target method
+    // call is the method call for which we couldn't find a target method
     if (receiver==classNodeFor(String)
             && name=='longueur'
             && argList.size()==0) {
         handled = true
         return newMethod('longueur', classNodeFor(String))
     }
 }
-// end::event[]
+// end::event[]

src/spec/test/gdk/WorkingWithIOSpecTest.groovy

@@ -130,7 +130,7 @@ Fin.''')
             new File(baseDir,'haiku.txt').withWriter('utf-8') { writer ->
                 writer.writeLine 'Into the ancient pond'
                 writer.writeLine 'A frog jumps'
-                writer.writeLine 'Water’s sound!'
+                writer.writeLine "Water's sound!"
             }
             // end::withwriter_example[]
         }
@@ -143,7 +143,7 @@ Fin.''')
             // tag::file_leftshift[]
             new File(baseDir,'haiku.txt') << '''Into the ancient pond
             A frog jumps
-            Water’s sound!'''
+            Water's sound!'''
             // end::file_leftshift[]
         }
     }

subprojects/groovy-typecheckers/src/main/groovy/groovy/typecheckers/FormatStringChecker.groovy

@@ -42,9 +42,9 @@ import static org.codehaus.groovy.ast.ClassHelper.makeCached
 
 /**
  * Checks at compile-time for incorrect format strings in format methods such as {@code printf} and {@code String.format}.
- * A format method’s specification requires that:
+ * A format method's specification requires that:
  * <ul>
- • <li>The format string’s syntax is valid</li>
+ • <li>The format string's syntax is valid</li>
  • <li>The correct number of arguments is passed</li>
  • <li>Each argument has the appropriate type</li>
  * </ul>