docs: uses new go1.19 doc features

Signed-off-by: Maxime Soulé <btik-git@scoubidou.com>

Author: maxatome

file.go

@@ -13,18 +13,18 @@ import (
 //	file := httpmock.File("file.txt")
 //	fmt.Printf("file: %s\n", file)
 //
-// prints the content of file "file.txt" as String() method is used.
+// prints the content of file "file.txt" as [File.String] method is used.
 //
 // To print the file name, and not its content, simply do:
 //
 //	file := httpmock.File("file.txt")
 //	fmt.Printf("file: %s\n", string(file))
 type File string
 
-// MarshalJSON implements json.Marshaler.
+// MarshalJSON implements [encoding/json.Marshaler].
 //
-// Useful to be used in conjunction with NewJsonResponse() or
-// NewJsonResponder() as in:
+// Useful to be used in conjunction with [NewJsonResponse] or
+// [NewJsonResponder] as in:
 //
 //	httpmock.NewJsonResponder(200, httpmock.File("body.json"))
 func (f File) MarshalJSON() ([]byte, error) {
@@ -38,8 +38,8 @@ func (f File) bytes() ([]byte, error) {
 // Bytes returns the content of file as a []byte. If an error occurs
 // during the opening or reading of the file, it panics.
 //
-// Useful to be used in conjunction with NewBytesResponse() or
-// NewBytesResponder() as in:
+// Useful to be used in conjunction with [NewBytesResponse] or
+// [NewBytesResponder] as in:
 //
 //	httpmock.NewBytesResponder(200, httpmock.File("body.raw").Bytes())
 func (f File) Bytes() []byte {
@@ -50,11 +50,12 @@ func (f File) Bytes() []byte {
 	return b
 }
 
-// String returns the content of file as a string. If an error occurs
-// during the opening or reading of the file, it panics.
+// String implements [fmt.Stringer] and returns the content of file as
+// a string. If an error occurs during the opening or reading of the
+// file, it panics.
 //
-// Useful to be used in conjunction with NewStringResponse() or
-// NewStringResponder() as in:
+// Useful to be used in conjunction with [NewStringResponse] or
+// [NewStringResponder] as in:
 //
 //	httpmock.NewStringResponder(200, httpmock.File("body.txt").String())
 func (f File) String() string {