Target sketch specification reference links to appropriate section

The Arduino Sketch Specification document has had some recent changes to avoid ambiguity. This allows the reference
links to now point to the specific section of the specification relevant to that rule so that the user will be able to
find the information quickly.

Author: per1234

internal/rule/ruleconfiguration/ruleconfiguration.go

@@ -1377,7 +1377,7 @@ var configurations = []Type{
 		Brief:            "prohibited character in filename",
 		Description:      "A sketch file's name contains a prohibited character.",
 		MessageTemplate:  "Prohibited character(s) in file name(s): {{.}}",
-		Reference:        "https://arduino.github.io/arduino-cli/latest/sketch-specification/#sketch-root-folder",
+		Reference:        "https://arduino.github.io/arduino-cli/latest/sketch-specification/#sketch-folders-and-files",
 		DisableModes:     nil,
 		EnableModes:      []rulemode.Type{rulemode.Default},
 		InfoModes:        nil,
@@ -1394,7 +1394,7 @@ var configurations = []Type{
 		Brief:            "file name too long",
 		Description:      "The sketch file's name exceeds the maximum length.",
 		MessageTemplate:  "File name(s): {{.}} exceed maximum length.",
-		Reference:        "https://arduino.github.io/arduino-cli/latest/sketch-specification/#sketch-root-folder",
+		Reference:        "https://arduino.github.io/arduino-cli/latest/sketch-specification/#sketch-folders-and-files",
 		DisableModes:     nil,
 		EnableModes:      []rulemode.Type{rulemode.Default},
 		InfoModes:        nil,
@@ -1411,7 +1411,7 @@ var configurations = []Type{
 		Brief:            ".pde extension",
 		Description:      "A sketch file uses the deprecated `.pde` file extension. The .pde extension is used by both [Processing](https://processing.org/) sketches and Arduino sketches. If the project has supplemental Processing sketches, they should either be in the [`data` subfolder of the sketch](https://arduino.github.io/arduino-cli/latest/sketch-specification/#data-subfolder) or in the [`extras` folder of the library](https://arduino.github.io/arduino-cli/latest/library-specification/#extra-documentation). Arduino sketches should use the modern `.ino` extension.",
 		MessageTemplate:  "{{.}} uses deprecated .pde file extension. Use .ino for Arduino sketches.",
-		Reference:        "https://arduino.github.io/arduino-cli/latest/sketch-specification",
+		Reference:        "https://arduino.github.io/arduino-cli/latest/sketch-specification/#additional-code-files",
 		DisableModes:     nil,
 		EnableModes:      []rulemode.Type{rulemode.Default},
 		InfoModes:        nil,