fixed env vars

InstructionsForAmazonEMR.ipynb

@@ -40,7 +40,7 @@
       "\n",
       "To set yourself up to use `mrjob` on Amazon, after getting your Amazon credits and setting up an AWS account, read the following [QuickStart](http://pythonhosted.org/mrjob/guides/emr-quickstart.html). If you follow the instructions in there, you should have set up your access key, optionally set up ssh tunnel access, and written your access keys to the ~/.mrjob.conf file. You could also set\n",
       "\n",
-      "    MRJOB CONF=/home/you/yourpath/fileName.txt\n",
+      "    MRJOB_CONF=/home/you/yourpath/fileName.txt\n",
       "    \n",
       "with the appropriate syntax in bash/csh/zsh/command.exe.\n",
       "\n",
@@ -52,8 +52,8 @@
       "\n",
       "Type following two commands in your terminal:\n",
       "\n",
-      "* export AWS ACCESS KEY ID=xxxxxx\n",
-      "* export AWS SECRET ACCESS KEY=yyyyyy\n",
+      "* export AWS_ACCESS_KEY ID=xxxxxx\n",
+      "* export AWS_SECRET_ACCESS_KEY=yyyyyy\n",
       "\n",
       "where the xxxxxx and yyyyyy are your Access Key ID and Secret Access Key, respectively. (or the windows or csh equivalents).\n",
       "\n",
@@ -72,4 +72,4 @@
    "metadata": {}
   }
  ]
-}
+}