Update go.html.markdown (#4284)

go.html.markdown

@@ -179,7 +179,7 @@ func learnNamedReturns(x, y int) (z int) {
 
 // Go is fully garbage collected. It has pointers but no pointer arithmetic.
 // You can make a mistake with a nil pointer, but not by incrementing a pointer.
-// Unlike in C/Cpp taking and returning an address of a local varible is also safe. 
+// Unlike in C/Cpp taking and returning an address of a local variable is also safe. 
 func learnMemory() (p, q *int) {
 	// Named return values p and q have type pointer to int.
 	p = new(int) // Built-in function new allocates memory.