Fixed some typos in JavaDoc

Author: m0nk3y2k4

src/main/java/com/github/m0nk3y2k4/thetvdb/internal/util/validation/Parameters.java

@@ -160,7 +160,7 @@ public static void validateQueryParam(String paramName, QueryParameters params,
     }
 
     /**
-     * Provides a predicate used to check wether a String represents a positive (greater zero) numerical integer.
+     * Provides a predicate used to check whether a String represents a positive (greater zero) numerical integer.
      *
      * @return String predicate to check for a positive numerical integer
      */

src/test/java/com/github/m0nk3y2k4/thetvdb/testutils/MockServerUtil.java

@@ -101,7 +101,7 @@ public static Header contentLength(int length) {
      * object returned by this method will contain matchers verifying the absence of any authentication related
      * headers.
      *
-     * @return HTTP headers object including matchers verfying the absence of authorization headers
+     * @return HTTP headers object including matchers verifying the absence of authorization headers
      *
      * @see #defaultAPIHttpHeadersWithAuthorization()
      */
@@ -115,7 +115,7 @@ public static Headers defaultAPIHttpHeaders() {
      * object returned by this method will contain matchers verifying that the authentication related headers exist and
      * contain some reasonable values.
      *
-     * @return HTTP headers object including matchers verfying the existence of authorization headers
+     * @return HTTP headers object including matchers verifying the existence of authorization headers
      *
      * @see #defaultAPIHttpHeaders()
      */