fix(docs): correct Error usage examples

Correct the usage of `assert.Equal` in the Error and NoError usage
examples, which had reversed the expected and actual arguments.

assert/assertions.go

@@ -892,7 +892,7 @@ func InEpsilonSlice(t TestingT, expected, actual interface{}, epsilon float64, m
 //
 //   actualObj, err := SomeFunction()
 //   if assert.NoError(t, err) {
-//	   assert.Equal(t, actualObj, expectedObj)
+//	   assert.Equal(t, expectedObj, actualObj)
 //   }
 //
 // Returns whether the assertion was successful (true) or not (false).
@@ -908,7 +908,7 @@ func NoError(t TestingT, err error, msgAndArgs ...interface{}) bool {
 //
 //   actualObj, err := SomeFunction()
 //   if assert.Error(t, err, "An error was expected") {
-//	   assert.Equal(t, err, expectedError)
+//	   assert.Equal(t, expectedError, err)
 //   }
 //
 // Returns whether the assertion was successful (true) or not (false).