docs: update docs to note that linting supports slnx and slnf files (#744)

---------

Co-authored-by: Andrii Chebukin <XperiAndri@Outlook.com>

Author: Numpsy

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fix MSBuild integration sample in docs #750 [@xperiandri]
 - Exit after printing out version information #743 [@numpsy]
 - Fix .NET 8 support #748 [@xperiandri]
+- Update docs to note that linting supports `slnx` and `slnf` files #744 [@numpsy]
 
 ## [0.25.0] - 2025-07-11
 

docs/content/index.md

@@ -13,7 +13,7 @@ The project aims to let the user know of problems through [matching user defined
 a la [HLint](http://community.haskell.org/~ndm/hlint/), and also by using custom rules written in F# similar to the rules
 in [Mascot](http://mascot.x9c.fr/manual.html) and [StyleCop](http://stylecop.codeplex.com/).
 
-Using a `.fsproj` (F# project) or `.sln` (F# solution) file the tool will analyse all of the F# implementation files in the project/solution looking for
+Using a `.fsproj` (F# project) or `.sln` / `.slnx` / `.slnf` (F# solution) file the tool will analyse all of the F# implementation files in the project/solution looking for
 code that breaks a set of rules governing the style of the code. Examples of rules: lambda functions must be less than 6 lines long, class member identifiers must be PascalCase.
 
 ## Usage

src/FSharpLint.Core/Application/Lint.fs

@@ -454,7 +454,7 @@ module Lint =
             FailedToLoadFile projectFilePath
             |> LintResult.Failure
 
-    /// Lints an entire F# solution by linting all projects specified in the `.sln` file.
+    /// Lints an entire F# solution by linting all projects specified in the `.sln`, `slnx` or `.slnf` file.
     let lintSolution (optionalParams:OptionalLintParameters) (solutionFilePath:string) (toolsPath:Ionide.ProjInfo.Types.ToolsPath) =
         if IO.File.Exists solutionFilePath then
             let solutionFilePath = Path.GetFullPath solutionFilePath

src/FSharpLint.Core/Application/Lint.fsi

@@ -125,7 +125,7 @@ module Lint =
     /// Runs all rules which take a line of text as input.
     val runLineRules : LineRules -> Rules.GlobalRuleConfig -> string -> string -> string [] -> Context -> Suggestion.LintWarning []
 
-    /// Lints an entire F# solution by linting all projects specified in the `.sln` file.
+    /// Lints an entire F# solution by linting all projects specified in the `.sln`, `slnx` or `.slnf` file.
     val lintSolution : optionalParams:OptionalLintParameters -> solutionFilePath:string -> toolsPath:Ionide.ProjInfo.Types.ToolsPath -> LintResult
 
     /// Lints an entire F# project by retrieving the files from a given