docs - stripping extra new lines

docs/content/guide/dev_guide.compiler.widgets.ngdoc

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 @name Developer Guide: Angular HTML Compiler: Understanding Angular Widgets
 @description
 
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 Widgets are DOM elements that the browser doesn't already understand. Angular provides some
 built-in widgets (such as {@link api/angular.widget.@ng:repeat ng:repeat}), and you can create your
 own custom widgets.
 
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 Widgets are intended to manipulate the DOM tree by adding new elements (unlike {@link
 dev_guide.compiler.directives angular directives}, which are intended to modify only element
 properties).
 
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 Widgets come in two types:
 
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 * Element Widget — A custom DOM element.  An example of a custom element is shown in {@link
 dev_guide.compiler.widgets.creating_widgets Creating Custom Widgets}.
 
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 * Attribute Widget — A custom attribute on an existing DOM element.  An attribute widget is similar
 to an angular directive, with the main difference being that an attribute widget will always be
 processed before any directives that are specified on the same element.  Only one attribute widget
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 ## Related Topics
 
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 * {@link dev_guide.compiler Angular HTML Compiler}
 * {@link dev_guide.compiler.directives Angular Directives}
 * {@link dev_guide.compiler.widgets.creating_widgets Creating Custom Widgets}
 * {@link dev_guide.compiler.directives.creating_directives Creating Custom Directives}
 
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 ## Related API
 
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 * {@link api/angular.compile Compiler API}