Add a first pass at jsdoc.

[##130415655] #596

src/core/matchers/toBeLessThan.js

@@ -1,4 +1,12 @@
 getJasmineRequireObj().toBeLessThan = function() {
+  /**
+   * {@link expect} the actual value to be less than the expected value.
+   * @function
+   * @name matchers#toBeLessThan
+   * @param {Number} expected - The expected value to compare against.
+   * @example
+   * expect(result).toBeLessThan(0);
+   */
   function toBeLessThan() {
     return {
 
@@ -11,4 +19,4 @@ getJasmineRequireObj().toBeLessThan = function() {
   }
 
   return toBeLessThan;
-};
+};