DevTools: [Documentation] Add signature section for renderer

Source/devtools/front_end/documentationView.css

Index: Source/devtools/front_end/documentationView.css
diff --git a/Source/devtools/front_end/documentationView.css b/Source/devtools/front_end/documentationView.css
index fc22f725160f00c689d4b47341b89435f0db73d6..7447a45b92ba79ca8b17cc803468310f67e067ff 100644
--- a/Source/devtools/front_end/documentationView.css
+++ b/Source/devtools/front_end/documentationView.css
@@ -64,19 +64,19 @@
     padding: 0.7ex;
     background-color: rgb(219, 234, 249);
     text-decoration: none;
-    margin-left: 1ex;
-    margin-top: -0.5ex;
     border-radius: 5px;
 }
 
 .documentation-parameter-data-type-value {
-    margin-right: 0.5em;
     padding: 0.7ex;
     background-color: rgb(254, 254, 202);
     text-decoration: none;
+    border-radius: 5px;
+}
+
+.documentation-parameter-margin {
     margin-left: 1ex;
     margin-top: -0.5ex;
-    border-radius: 5px;
 }
 
 .documentation-parameter-name {
@@ -84,6 +84,13 @@
     font-style: italic;
 }
 
+.documentation-return-type {
+    padding: 0.7ex;
+    background-color: rgb(213, 255, 212);
+    text-decoration: none;
+    border-radius: 5px;
+}
+
 .documentation-page-title {
     font-size: 160%;
     font-weight: bold;