fix: 移除重复的英文

public/docs/ts/latest/guide/template-syntax.jade

@@ -1794,8 +1794,6 @@ figure.image-display
 :marked
   ### NgClass
 
-  ### NgClass
-
   We typically control how elements appear
   by adding and removing CSS classes dynamically.
   We can bind to `NgClass` to add or remove several classes simultaneously.
@@ -1845,8 +1843,6 @@ figure.image-display
 :marked
   ### NgStyle
 
-  ### NgStyle
-
   We can set inline styles dynamically, based on the state of the component.
   Binding to `NgStyle` lets us set many inline styles simultaneously.
 
@@ -1893,8 +1889,6 @@ figure.image-display
 :marked
   ### NgIf
 
-  ### NgIf
-
   We can add an element subtree (an element and its children) to the DOM  by binding an `NgIf` directive to a #{_truthy} expression.
 
   通过绑定`NgIf`指令到真值表达式，可以把元素子树（元素及其子元素）添加到 DOM 上。
@@ -1959,8 +1953,6 @@ block dart-no-truthy-falsy
 :marked
   ### NgSwitch
 
-  ### NgSwitch
-
   We bind to `NgSwitch` when we want to display *one* element tree (an element and its children)
   from a *set* of possible element trees, based on some condition.
   Angular puts only the *selected* element tree into the DOM.
@@ -2039,8 +2031,6 @@ block dart-no-truthy-falsy
 :marked
   ### NgFor
 
-  ### NgFor
-
   `NgFor` is a _repeater_ directive — a way to customize data display.
 
   `NgFor`是一个_重复器_指令 —— 自定义数据显示的一种方式。
@@ -2144,8 +2134,6 @@ block dart-no-truthy-falsy
 :marked
   #### NgForTrackBy
 
-  #### NgForTrackBy
-
   The `ngFor` directive has the potential to perform poorly, especially with large lists.
   A small change to one item, an item removed, or an item added can trigger a cascade of DOM manipulations.