[clang-doc] Fix whitespace issues in Mustache basic test (llvm#168491)

I found that the issues we've been seeing in the HTML
whitespace/alignment are due to partials inserting their own whitespace
and calling partials on indented lines or lines containing text already.
This patch gets rid of unnecessary whitespace in the comment and
function partials so that they are properly indented when inserted.

Author: evelez7

clang-tools-extra/clang-doc/assets/class-template.mustache

@@ -174,7 +174,7 @@
                 <h2>Public Methods</h2>
                 <div>
                     {{#PublicFunctions}}
-{{>FunctionPartial}}
+                    {{>FunctionPartial}}
                     {{/PublicFunctions}}
                 </div>
             </section>

clang-tools-extra/clang-doc/assets/comment-template.mustache

@@ -6,61 +6,61 @@
     This file defines templates for generating comments
 }}
 {{#BriefComments}}
-    <div>
-    {{#.}}
-        <p>{{TextComment}}</p>
-    {{/.}}
-    </div>
+<div>
+{{#.}}
+    <p>{{TextComment}}</p>
+{{/.}}
+</div>
 {{/BriefComments}}
 {{#ParagraphComments}}
-    <div>
-    {{#.}}
-        <p>{{TextComment}}</p>
-    {{/.}}
-    </div>
+<div>
+{{#.}}
+    <p>{{TextComment}}</p>
+{{/.}}
+</div>
 {{/ParagraphComments}}
 {{#ParagraphComment}}
-    {{#Children}}
-    {{>Comments}}
-    {{/Children}}
+{{#Children}}
+{{TextComment}}
+{{/Children}}
 {{/ParagraphComment}}
 {{#HasParamComments}}
-    <h3>Parameters</h3>
-    {{#ParamComments}}
-    <div>
-        <b>{{ParamName}}</b> {{#Explicit}}{{Direction}}{{/Explicit}} {{#Children}}{{>Comments}}{{/Children}}
-    </div> 
-    {{/ParamComments}}
+<h3>Parameters</h3>
+{{#ParamComments}}
+<div>
+    <b>{{ParamName}}</b> {{#Explicit}}{{Direction}}{{/Explicit}} {{#Children}}{{TextComment}}{{/Children}}
+</div> 
+{{/ParamComments}}
 {{/HasParamComments}}
 {{#HasReturnComments}}
-    <h3>Returns</h3>
-    {{#ReturnComments}}
-        {{#.}}
-        <p>{{TextComment}}</p>
-        {{/.}}
-    {{/ReturnComments}}
+<h3>Returns</h3>
+{{#ReturnComments}}
+{{#.}}
+<p>{{TextComment}}</p>
+{{/.}}
+{{/ReturnComments}}
 {{/HasReturnComments}}
 {{#HasCodeComments}}
-    <h3>Code</h3> 
-    {{#CodeComments}}
-    <div>
-        <pre class="code-block">
-            <code>
-            {{#.}}
+<h3>Code</h3> 
+{{#CodeComments}}
+<div>
+    <pre class="code-block">
+        <code>
+        {{#.}}
             {{.}}
-            {{/.}}
-            </code>
-        </pre>
-    </div>
-    {{/CodeComments}}
+        {{/.}}
+        </code>
+    </pre>
+</div>
+{{/CodeComments}}
 {{/HasCodeComments}}
 {{#HasThrowsComments}}
-    <h3>Throws</h3>
-    {{#ThrowsComments}}
-    <div>
-        <b>{{Exception}}</b> {{#Children}}{{TextComment}}{{/Children}}
-    </div>
-    {{/ThrowsComments}}
+<h3>Throws</h3>
+{{#ThrowsComments}}
+<div>
+    <b>{{Exception}}</b> {{#Children}}{{TextComment}}{{/Children}}
+</div>
+{{/ThrowsComments}}
 {{/HasThrowsComments}}
 {{#BlockCommandComment}}
     <div class="block-command-comment__command">
@@ -74,8 +74,3 @@
         </div>
     </div>
 {{/BlockCommandComment}}
-{{#TextComment}}
-    <div>
-        <p>{{TextComment}}</p>
-    </div>
-{{/TextComment}}

clang-tools-extra/clang-doc/assets/function-template.mustache

@@ -8,11 +8,7 @@
 <div class="delimiter-container">
     <div id="{{USR}}">
         {{! Function Prototype }}
-        <pre>
-            <code class="language-cpp code-clang-doc">
-{{ReturnType.Name}} {{Name}} ({{#Params}}{{^End}}{{Type}} {{Name}}, {{/End}}{{#End}}{{Type}} {{Name}}{{/End}}{{/Params}})
-            </code>
-        </pre>
+        <pre><code class="language-cpp code-clang-doc">{{ReturnType.Name}} {{Name}} ({{#Params}}{{^End}}{{Type}} {{Name}}, {{/End}}{{#End}}{{Type}} {{Name}}{{/End}}{{/Params}})</code></pre>
         {{! Function Comments }}
         {{#Description}}
         <div>