F# docs - add info about capitalization of modules implied by script names (#25297)

* Update index.md

* Update index.md

* Update docs/fsharp/tools/fsharp-interactive/index.md

Co-authored-by: Andy (Steve) De George <[email protected]>

Co-authored-by: Andy (Steve) De George <[email protected]>

Author: dsyme

docs/fsharp/tools/fsharp-interactive/index.md

@@ -179,8 +179,6 @@ open Script1
 printfn $"%d{square 12}"
 ```
 
-Note that the `open Script1` declaration is required. This is because constructs in an F# script are compiled into a top-level module that is the name of the script file it is in.
-
 You can evaluate `Script2.fsx` like so:
 
 ```console
@@ -190,6 +188,13 @@ dotnet fsi Script2.fsx
 
 You can specify as many `#load` directives as you like in a script.
 
+> [!NOTE]
+> The `open Script1` declaration is required. This is because constructs in an F# script are compiled into a top-level module that is the name of the script file it is in. If the script file has a lowercase name such as `script3.fsx` then the implied module name is automatically capitalized, and you will need to use `open Script3`. If you would like a loadable-script to define constructs in a specific namespace of module you can include a namespace of module declaration, for example:
+>
+> ```fsharp
+> module MyScriptLibrary
+> ```
+
 ## Using the `fsi` object in F# code
 
 F# scripts have access to a custom `fsi` object that represents the F# Interactive session. It allows you to customize things like output formatting. It is also how you can access command-line arguments.