docs: fix typos in testdata (#4116)

Author: alexandear

test/testdata/forbidigo_example.go

@@ -10,6 +10,6 @@ import (
 
 func Forbidigo() {
 	fmt.Printf("too noisy!!!")  // want "use of `fmt\\.Printf` forbidden by pattern `fmt\\\\.Print\\.\\*`"
-	fmt2.Printf("too noisy!!!") // Not detected because analyze-types is false by default for backward compatbility.
+	fmt2.Printf("too noisy!!!") // Not detected because analyze-types is false by default for backward compatibility.
 	time.Sleep(time.Nanosecond) // want "no sleeping!"
 }

test/testdata/gochecknoglobals.go

@@ -8,7 +8,7 @@ import (
 )
 
 var noGlobalsVar int // want "noGlobalsVar is a global variable"
-var ErrSomeType = errors.New("test that global erorrs aren't warned")
+var ErrSomeType = errors.New("test that global errors aren't warned")
 
 var (
 	OnlyDigites = regexp.MustCompile(`^\d+$`)

test/testdata/nonamedreturns_custom.go

@@ -56,21 +56,21 @@ var (
 )
 
 // this should not match as the implementation does not need named parameters (see below)
-type funcDefintion func(arg1, arg2 interface{}) (num int, err error)
+type funcDefinition func(arg1, arg2 interface{}) (num int, err error)
 
-func funcDefintionImpl(arg1, arg2 interface{}) (int, error) {
+func funcDefinitionImpl(arg1, arg2 interface{}) (int, error) {
 	return 0, nil
 }
 
-func funcDefintionImpl2(arg1, arg2 interface{}) (num int, err error) { // want `named return "num" with type "int" found`
+func funcDefinitionImpl2(arg1, arg2 interface{}) (num int, err error) { // want `named return "num" with type "int" found`
 	return 0, nil
 }
 
-func funcDefintionImpl3(arg1, arg2 interface{}) (num int, _ error) { // want `named return "num" with type "int" found`
+func funcDefinitionImpl3(arg1, arg2 interface{}) (num int, _ error) { // want `named return "num" with type "int" found`
 	return 0, nil
 }
 
-func funcDefintionImpl4(arg1, arg2 interface{}) (_ int, _ error) {
+func funcDefinitionImpl4(arg1, arg2 interface{}) (_ int, _ error) {
 	return 0, nil
 }
 
@@ -88,12 +88,12 @@ func test() {
 	a := funcVar()
 	_ = a
 
-	var function funcDefintion
-	function = funcDefintionImpl
+	var function funcDefinition
+	function = funcDefinitionImpl
 	i, err := function("", "")
 	_ = i
 	_ = err
-	function = funcDefintionImpl2
+	function = funcDefinitionImpl2
 	i, err = function("", "")
 	_ = i
 	_ = err