zeppelin git commit: minor doc fix for r.md

[mi...@apache.org]

Repository: zeppelin
Updated Branches:
  refs/heads/master 52b3cbff7 -> 6b6f1cb76


minor doc fix for r.md

### What is this PR for?
straightforward doc fix

### What type of PR is it?
[Documentation]

### Todos
* [ ] - Task

### What is the Jira issue?
* No jira created as it is very trival.

### Screenshots (if appropriate)

### Questions:
* Does the licenses files need update? No
* Is there breaking changes for older versions? No
* Does this needs documentation? No

Author: Jeff Zhang <zj...@apache.org>

Closes #1268 from zjffdu/r_doc_fix and squashes the following commits:

105fead [Jeff Zhang] minor doc fix for r.md


Project: http://git-wip-us.apache.org/repos/asf/zeppelin/repo
Commit: http://git-wip-us.apache.org/repos/asf/zeppelin/commit/6b6f1cb7
Tree: http://git-wip-us.apache.org/repos/asf/zeppelin/tree/6b6f1cb7
Diff: http://git-wip-us.apache.org/repos/asf/zeppelin/diff/6b6f1cb7

Branch: refs/heads/master
Commit: 6b6f1cb76cb2c9701a3accb3a4ee365d6566eb7a
Parents: 52b3cbf
Author: Jeff Zhang <zj...@apache.org>
Authored: Wed Aug 3 07:51:07 2016 +0800
Committer: Mina Lee <mi...@apache.org>
Committed: Wed Aug 3 11:56:24 2016 +0900

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 docs/interpreter/r.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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http://git-wip-us.apache.org/repos/asf/zeppelin/blob/6b6f1cb7/docs/interpreter/r.md
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diff --git a/docs/interpreter/r.md b/docs/interpreter/r.md
index bc94fff..e4f4a9f 100644
--- a/docs/interpreter/r.md
+++ b/docs/interpreter/r.md
@@ -104,7 +104,7 @@ And vice versa:
 
 * The `knitr` environment is persistent. If you run a chunk from Zeppelin that changes a variable, then run the same chunk again, the variable has already been changed.  Use immutable variables.
 
-* (Note that `%spark.r` and `$r` are two different ways of calling the same interpreter, as are `%spark.knitr` and `%knitr`. By default, Zeppelin puts the R interpreters in the `%spark.` Interpreter Group.
+* (Note that `%spark.r` and `%r` are two different ways of calling the same interpreter, as are `%spark.knitr` and `%knitr`. By default, Zeppelin puts the R interpreters in the `%spark.` Interpreter Group.
 
 * Using the `%r` interpreter, if you return a data.frame, HTML, or an image, it will dominate the result. So if you execute three commands, and one is `hist()`, all you will see is the histogram, not the results of the other commands. This is a Zeppelin limitation.