[SPARK-6806] [SPARKR] [DOCS] Fill in SparkR examples in programming guide

sqlCtx -> sqlContext

You can check the docs by:

```
$ cd docs
$ SKIP_SCALADOC=1 jekyll serve
```
cc shivaram

Author: Davies Liu <davies@databricks.com>

Closes #5442 from davies/r_docs and squashes the following commits:

7a12ec6 [Davies Liu] remove rdd in R docs
8496b26 [Davies Liu] remove the docs related to RDD
e23b9d6 [Davies Liu] delete R docs for RDD API
222e4ff [Davies Liu] Merge branch 'master' into r_docs
89684ce [Davies Liu] Merge branch 'r_docs' of github.com:davies/spark into r_docs
f0a10e1 [Davies Liu] address comments from @shivaram
f61de71 [Davies Liu] Update pairRDD.R
3ef7cf3 [Davies Liu] use + instead of function(a,b) a+b
2f10a77 [Davies Liu] address comments from @cafreeman
9c2a062 [Davies Liu] mention R api together with Python API
23f751a [Davies Liu] Fill in SparkR examples in programming guide

1 files changed, 3 insertions, 3 deletions

diff --git a/R/pkg/inst/profile/shell.R b/R/pkg/inst/profile/shell.R
index 33478d9e29..ca94f1d4e7 100644
--- a/R/pkg/inst/profile/shell.R
+++ b/R/pkg/inst/profile/shell.R
@@ -26,8 +26,8 @@
 
   sc <- SparkR::sparkR.init(Sys.getenv("MASTER", unset = ""))
   assign("sc", sc, envir=.GlobalEnv)
-  sqlCtx <- SparkR::sparkRSQL.init(sc)
-  assign("sqlCtx", sqlCtx, envir=.GlobalEnv)
+  sqlContext <- SparkR::sparkRSQL.init(sc)
+  assign("sqlContext", sqlContext, envir=.GlobalEnv)
   cat("\n Welcome to SparkR!")
-  cat("\n Spark context is available as sc, SQL context is available as sqlCtx\n")
+  cat("\n Spark context is available as sc, SQL context is available as sqlContext\n")
 }