Documentation/user-review: remove syntax coloring screenshot

Change-Id: Iae4e63abfa360a711771667c28486cce4591b0d5
diff --git a/Documentation/images/gwt-user-review-ui-side-by-side-diff-screen-syntax-coloring.png b/Documentation/images/gwt-user-review-ui-side-by-side-diff-screen-syntax-coloring.png
deleted file mode 100644
index a4b019a..0000000
--- a/Documentation/images/gwt-user-review-ui-side-by-side-diff-screen-syntax-coloring.png
+++ /dev/null
Binary files differ
diff --git a/Documentation/user-review-ui.txt b/Documentation/user-review-ui.txt
index eec0e06..a09135f 100644
--- a/Documentation/user-review-ui.txt
+++ b/Documentation/user-review-ui.txt
@@ -973,10 +973,7 @@
 Controls whether syntax highlighting should be enabled.
 +
 The language for the syntax highlighting is automatically detected from
-the file extension. The language can also be set manually by selecting
-it from the `Language` drop-down list.
-+
-image::images/gwt-user-review-ui-side-by-side-diff-screen-syntax-coloring.png[width=800, link="images/gwt-user-review-ui-side-by-side-diff-screen-syntax-coloring.png"]
+the file extension.
 
 - [[whitespace-errors]]`Whitespace Errors`:
 +