few text tweaks

src/main/scala/stdlib/Classes.scala

@@ -29,9 +29,9 @@ object Classes extends FlatSpec with Matchers with org.scalaexercises.definition
     * }
     * }}}
     *
-    * The program defines an executable application `Classes` in form of a top-level singleton object with a `main` method. The `main` method creates a new `Point` and stores it in value `pt`.
+    * The program defines an executable application `Classes` in the form of a top-level singleton object with a `main` method. The `main` method creates a new `Point` and stores it in value `pt`.
     *
-    * This also demonstrates the use of a value parameters in ClassWithValParameter(val name: String), which automatically creates an internal property (val name: String) in the class.
+    * This also demonstrates the use of value parameters in ClassWithValParameter(val name: String), which automatically creates an internal property (val name: String) in the class.
     *
     */
   def classWithValParameterClasses(res0: String) {

src/main/scala/stdlib/HigherOrderFunctions.scala

@@ -9,7 +9,7 @@ object HigherOrderFunctions extends FlatSpec with Matchers with org.scalaexercis
 
   /** Meet lambda. Scala provides a relatively lightweight syntax for defining anonymous functions. Anonymous functions in source code are called function literals and at run time, function literals are instantiated into objects called function values.
     *
-    * Scala supports first-class functions, which means you can express functions in function literal syntax, i.e.,` (x: Int) => x + 1`, and that functions can be represented by objects, which are called function values.
+    * Scala supports first-class functions, which means you can express functions in function literal syntax, i.e.,` (x: Int) => x + 1`, and those functions can be represented by objects, which are called function values.
     */
   def meetLambdaHigherOrderFunctions(res0: Int, res1: Int, res2: Int, res3: Int, res4: Int, res5: Int) {
     def lambda = { x: Int ⇒ x + 1 }
@@ -68,7 +68,7 @@ object HigherOrderFunctions extends FlatSpec with Matchers with org.scalaexercis
     result2 should be(res1)
   }
 
-  /** We can take that closure and throw into a method and it will still hold the environment
+  /** We can take that closure and throw it into a method and it will still hold the environment
     */
   def holdEnvironmentHigherOrderFunctions(res0: Int, res1: Int) {
     def summation(x: Int, y: Int ⇒ Int) = y(x)
@@ -113,15 +113,15 @@ object HigherOrderFunctions extends FlatSpec with Matchers with org.scalaexercis
     fiveAdder(5) should be(res2)
   }
 
-  /** `isInstanceOf` is the same as `instanceof` in java, but in this case the parameter types can be *blanked out* using existential types with a single underline, since parameter type are unknown at runtime.
+  /** `isInstanceOf` is the same as `instanceof` in java, but in this case the parameter types can be *blanked out* using existential types with a single underline, since parameter types are unknown at runtime.
     */
   def isInstanceOfMethodHigherOrderFunctions(res0: Boolean) {
     def addWithSyntaxSugar(x: Int) = (y: Int) ⇒ x + y
 
     addWithSyntaxSugar(1).isInstanceOf[Function1[_, _]] should be(res0)
   }
 
-  /** Function taking another function as parameter. Helps in composing functions.
+  /** Function taking another function as a parameter. Helps in composing functions.
     *
     * Hint: a map method applies the function to each element of a list
     */

src/main/scala/stdlib/Options.scala

@@ -74,7 +74,7 @@ object Options extends FlatSpec with Matchers with org.scalaexercises.definition
   /** An alternative for pattern matching is performing collection style operations.
     * This is possible because an option could be looked at as a collection with either one or zero elements.
     *
-    * One of these operations is `map`. this operation allows to map the inner value to a different type while preserving the option
+    * One of these operations is `map`. This operation allows us to map the inner value to a different type while preserving the option
     */
   def mapOptions(res0: Option[Double], res1: Option[Double]) {
     val number: Option[Int] = Some(3)
@@ -88,7 +88,7 @@ object Options extends FlatSpec with Matchers with org.scalaexercises.definition
     /** Note that the type of result1 is now Option[Double], thanks to the scala type inference. */
   }
 
-  /** Another operation is `fold`. this operation will extract the value from the option, or provide a default if the value is `None`
+  /** Another operation is `fold`. This operation will extract the value from the option, or provide a default if the value is `None`
     */
   def foldOptions(res0: Int, res1: Int) {
     val number: Option[Int] = Some(3)