docs: Strangler explanation (#2969)

* fix step builder docs

* add strangler docs

strangler/src/main/java/com/iluwatar/strangler/HalfArithmetic.java

@@ -63,9 +63,9 @@ public class HalfArithmetic {
   }
 
   /**
-   * Chech if has any zero.
+   * Check if it has any zero.
    * @param nums numbers need to check
-   * @return if has any zero, return true, else, return false
+   * @return if it has any zero, return true, else, return false
    */
   public boolean ifHasZero(int... nums) {
     LOGGER.info("Arithmetic check zero {}", VERSION);

strangler/src/main/java/com/iluwatar/strangler/NewArithmetic.java

@@ -60,9 +60,9 @@ public class NewArithmetic {
   }
 
   /**
-   * Chech if has any zero.
+   * Check if it has any zero.
    * @param nums numbers need to check
-   * @return if has any zero, return true, else, return false
+   * @return if it has any zero, return true, else, return false
    */
   public boolean ifHasZero(int... nums) {
     LOGGER.info("Arithmetic check zero {}", VERSION);