Update doc files

Author: Amir Tocker

docs/ClientHintsMetaTag.html

@@ -28,14 +28,14 @@
 			<li class="dropdown">
 				<a href="classes.list.html" class="dropdown-toggle" data-toggle="dropdown">Classes<b class="caret"></b></a>
 				<ul class="dropdown-menu ">
-					<li><a href="ClientHintsMetaTag.html">ClientHintsMetaTag</a></li><li><a href="Cloudinary.html">Cloudinary</a></li><li><a href="Condition.html">Condition</a></li><li><a href="Configuration.html">Configuration</a></li><li><a href="Expression.html">Expression</a></li><li><a href="FetchLayer.html">FetchLayer</a></li><li><a href="HtmlTag.html">HtmlTag</a></li><li><a href="ImageTag.html">ImageTag</a></li><li><a href="Layer.html">Layer</a></li><li><a href="SubtitlesLayer.html">SubtitlesLayer</a></li><li><a href="TextLayer.html">TextLayer</a></li><li><a href="Transformation.html">Transformation</a></li><li><a href="TransformationBase.html">TransformationBase</a></li><li><a href="Util.html">Util</a></li><li><a href="VideoTag.html">VideoTag</a></li>
+					<li><a href="ClientHintsMetaTag.html">ClientHintsMetaTag</a></li><li><a href="Cloudinary.html">Cloudinary</a></li><li><a href="Condition.html">Condition</a></li><li><a href="Configuration.html">Configuration</a></li><li><a href="Expression.html">Expression</a></li><li><a href="FetchLayer.html">FetchLayer</a></li><li><a href="HtmlTag.html">HtmlTag</a></li><li><a href="ImageTag.html">ImageTag</a></li><li><a href="Layer.html">Layer</a></li><li><a href="module-utils-Util.html">utils~Util</a></li><li><a href="SourceTag.html">SourceTag</a></li><li><a href="SubtitlesLayer.html">SubtitlesLayer</a></li><li><a href="TextLayer.html">TextLayer</a></li><li><a href="Transformation.html">Transformation</a></li><li><a href="TransformationBase.html">TransformationBase</a></li><li><a href="VideoTag.html">VideoTag</a></li>
 				</ul>
 			</li>
 
 			<li class="dropdown">
 				<a href="global.html" class="dropdown-toggle" data-toggle="dropdown">Global<b class="caret"></b></a>
 				<ul class="dropdown-menu ">
-					<li><a href="global.html#slice">slice</a></li>
+					<li><a href="global.html#toAttribute">toAttribute</a></li><li><a href="global.html#value">value</a></li>
 				</ul>
 			</li>
 
@@ -263,113 +263,6 @@ <h6 class="method-params-label method-subparams-label">Properties</h6>
 
 
 
-        <h3 class="subsection-title">Methods</h3>
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-    <h4 class="name" id="toString">#toString()</h4>
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-    <div class="description">
-        <p>generate the string representation of the layer</p>
-    </div>
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-<dl class="details">
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-</dl>
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-<h5>Returns: 
-<span class="param-type">String</span>
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-<dl>
-    <dt>
-        Type
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-    <dd>
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-<span class="param-type">String</span>
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-</dl>
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