docs(modules): fix typos

closes #2914

modules/angular2/docs/core/02_directives.md

@@ -52,7 +52,7 @@ CSS Selectors can be combined:
 
 ## Directives
 
-The simplest kind of directive is a decorator. Directives are usefull for encapsulating behavior.
+The simplest kind of directive is a decorator. Directives are useful for encapsulating behavior.
 
 * Multiple decorators can be placed on a single element.
 * Directives do not introduce new evaluation context.
@@ -260,7 +260,7 @@ Injecting other directives into directives follows a similar mechanism as inject
 
 There are five kinds of visibilities:
 
-* (no annotation): Inject dependant directives only if they are on the current element.
+* (no annotation): Inject dependent directives only if they are on the current element.
 * `@ancestor`: Inject a directive if it is at any element above the current element.
 * `@parent`: Inject a directive which is a direct parent of the current element.
 * `@child`: Inject a list of direct children which match a given type. (Used with `Query`)
@@ -325,7 +325,7 @@ Assume the following DOM structure for `my_app.html`:
 
 #### Shadow DOM effects on Directive DI
 
-Shadow DOM provides an encapsulation for components, so as a general rule it does not allow directive injections to cross the shadow DOM boundaries. To remedy this, declaritively specify the required component as an injectable.
+Shadow DOM provides an encapsulation for components, so as a general rule it does not allow directive injections to cross the shadow DOM boundaries. To remedy this, declaratively specify the required component as an injectable.
 
 ```
 @Component({

modules/benchpress/docs/index.md

@@ -4,7 +4,7 @@ Benchpress is a framework for e2e performance tests.
 
 # Why?
 
-There are so called "micro benchmarks" that esentially use a stop watch in the browser to measure time
+There are so called "micro benchmarks" that essentially use a stop watch in the browser to measure time
 (e.g. via `performance.now()`). This approach is limited to time, and in some cases memory
 (Chrome with special flags), as metric. It does not allow to measure:
 
@@ -80,7 +80,7 @@ index.html:
   var container = document.getElementById('container');
   var complexHtmlString = '...'; // TODO
 
-  function reset() { cotainer.innerHTML = ''; }
+  function reset() { container.innerHTML = ''; }
 
   function fill() {
     container.innerHTML = complexHtmlString;

modules/rtts_assert/README.js.md

@@ -28,7 +28,7 @@ assert(value).is(...)
 
 // Custom type assert:
 // - i have a custom type
-// - adding an assert methos
+// - adding an assert methods
 assert.define(MyUser, function(value) {
   assert(value).is(Type, Type2); // or
   assert(value, 'name').is(assert.string);