Merge pull request #385 from cgopalan/fix-spelling-exercise

Fix spelling of Exercise

Author: adrn

tutorials/notebooks/Coordinates-Intro/Coordinates-Intro.ipynb

@@ -271,7 +271,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "### Excercise 1"
+    "### Exercise 1"
    ]
   },
   {
@@ -296,7 +296,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "### Excercise 2"
+    "### Exercise 2"
    ]
   },
   {

tutorials/notebooks/Coordinates-Transform/Coordinates-Transform.ipynb

@@ -557,7 +557,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "### Excercise 1"
+    "### Exercise 1"
    ]
   },
   {
@@ -578,7 +578,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "### Excercise 2"
+    "### Exercise 2"
    ]
   },
   {
@@ -601,7 +601,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "### Excercise 3"
+    "### Exercise 3"
    ]
   },
   {