Rework safe functions

Closes #2252
Improves #2196

content/en/functions/safe/JSStr.md

@@ -13,12 +13,27 @@ action:
     - functions/safe/URL
   returnType: template.JSStr
   signatures: [safe.JSStr INPUT]
+toc: true
 aliases: [/functions/safejsstr]
 ---
 
-Encapsulates a sequence of characters meant to be embedded between quotes in a JavaScript expression. Use of this type presents a security risk: the encapsulated content should come from a trusted source, as it will be included verbatim in the template output.
-  
-Without declaring a variable to be a safe JavaScript string:
+## Introduction
+
+{{% include "functions/_common/go-html-template-package.md" %}}
+
+## Usage
+
+Use the `safe.JSStr` function to encapsulate a sequence of characters meant to be embedded between quotes in a JavaScript expression.
+
+Use of this type presents a security risk: the encapsulated content should come from a trusted source, as it will be included verbatim in the template output.
+
+See the [Go documentation] for details.
+
+[Go documentation]: https://pkg.go.dev/html/template#JSStr
+
+## Example
+
+Without a safe declaration:
 
 ```go-html-template
 {{ $title := "Lilo & Stitch" }}
@@ -27,7 +42,7 @@ Without declaring a variable to be a safe JavaScript string:
 </script>
 ```
 
-Rendered:
+Hugo renders the above to:
 
 ```html
 <script>
@@ -35,7 +50,7 @@ Rendered:
 </script>
 ```
 
-To avoid escaping by Go's [html/template] package:
+To declare the string as safe:
 
 ```go-html-template
 {{ $title := "Lilo & Stitch" }}
@@ -44,12 +59,10 @@ To avoid escaping by Go's [html/template] package:
 </script>
 ```
 
-Rendered:
+Hugo renders the above to:
 
 ```html
 <script>
   const a = "Title: " + "Lilo & Stitch";
 </script>
 ```
-
-[html/template]: https://pkg.go.dev/html/template