docs: clean docs to use consistent "sidebox" classes (eliminate sidebox-inner)

Change-Id: I8a2a343257b055b5447bca03a98e48ad4387ff42
diff --git a/docs/html/sdk/installing.jd b/docs/html/sdk/installing.jd
index 698c347..7b98e7f 100644
--- a/docs/html/sdk/installing.jd
+++ b/docs/html/sdk/installing.jd
@@ -130,7 +130,7 @@
 
 <h2 id="components">Add Android Platforms and Other Components</h2>
 
-<div class="sidebox-wrapper" style="margin-right:2.5em;">
+<div class="sidebox-wrapper">
 <div class="sidebox">
 <p>The <strong>Android SDK and AVD Manager</strong> tool is pre-installed in
 your SDK. Using the tool is a key part of performing the initial setup of your