doc: move description of 'equals' method to right place

the description of buffer.equals(otherBuffer) was at the wrong
place; move it underneath the method signature

PR-URL: https://github.com/nodejs/node/pull/4227
Reviewed-By: Brian White <mscdex@mscdex.net>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/api/buffer.markdown

@@ -208,9 +208,6 @@ Example: copy an ASCII string into a buffer, one byte at a time:
 
     // Node.js
 
-Returns a boolean indicating whether `this` and `otherBuffer` have the same
-bytes.
-
 ### buf.compare(otherBuffer)
 
 * `otherBuffer` {Buffer}
@@ -267,6 +264,8 @@ region in the same buffer
 
 * `otherBuffer` {Buffer}
 
+Returns a boolean indicating whether `this` and `otherBuffer` have the same bytes.
+
 ### buf.fill(value[, offset][, end])
 
 * `value`