fixed a typo and removed an unneeded exclamation

docs/examples/notebooks/00_notebook_tour.ipynb

@@ -983,7 +983,7 b''
      "source": [
       "## Linking to files and directories for viewing in the browser\n",
       "\n",
-      "It is also possible to link directly to files or directories so they can be opened in browser. This is especially convenient if you're interacting with a tool within IPython that generates HTML pages, and you'd like to easily be able to open those in a new browser window. Alternatively, if your IPython notebook server is on a remote system, creating links provides an easy way to download any files that get generated.\n",
+      "It is also possible to link directly to files or directories so they can be opened in the browser. This is especially convenient if you're interacting with a tool within IPython that generates HTML pages, and you'd like to easily be able to open those in a new browser window. Alternatively, if your IPython notebook server is on a remote system, creating links provides an easy way to download any files that get generated.\n",
       "\n",
       "As we saw above, there are a bunch of `.ipynb` files in our current directory."
      ]
@@ -992,7 +992,7 b''
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "!ls"
+      "ls"
      ],
      "language": "python",
      "metadata": {},
@@ -1012,7 +1012,7 b''
        ]
       }
      ],
-     "prompt_number": 6
+     "prompt_number": 1
     },
     {
      "cell_type": "markdown",