IMPLEMENTATIONS.md: Restore table header format (#2787)

Following the standardization of the table headers' formatting in 746b830, a slight deviation was reintroduced in 5984314.
This commit re-normalizes the headers so they're consistent again.

IMPLEMENTATIONS.md

@@ -61,8 +61,8 @@ These tools are not endorsed by the OAI.
 | API Sprout     | [github/danielgtaylor/apisprout](https://github.com/danielgtaylor/apisprout) | Go | Lightweight, blazing fast, cross-platform OpenAPI 3 mock server with validation |
 
 #### Testing tools
-| Title          | Project Link | Language | Description |
-| -------------- | ------------ | -------- | ----------- |
+| Title | Project Link | Language | Description |
+| ------|--------------|----------|-------------|
 | Schemathesis   | [github/schemathesis/schemathesis](https://github.com/schemathesis/schemathesis) | Python | A modern API testing tool for web applications built with OpenAPI and GraphQL specifications |
 
 #### Server Implementations
@@ -101,4 +101,4 @@ These tools are not endorsed by the OAI.
 | swagger-node-codegen | [github/fmvilas/swagger-node-codegen](https://github.com/fmvilas/swagger-node-codegen) | Node.js | Generates a Node.js/express server, but also has a template engine for creating any templates needed. |
 .NET-C#-Annotations | [github/Microsoft/OpenAPI-NET-CSharpAnnotations](https://github.com/Microsoft/OpenAPI.NET.CSharpAnnotations) | dotnet | Convert your native C# comments/annotation XML from your API code into a OpenAPI document object. |
 | Object Oriented OpenAPI Specification | [github/goldspecdigital/oooas](https://github.com/goldspecdigital/oooas) | PHP | Generates OpenAPI documents using PHP. |
-| swac | [github.com/swaggest/swac](https://github.com/swaggest/swac) | PHP, Go | Generates clients for Go and PHP from OpenAPI 2/3. |
+| swac | [github.com/swaggest/swac](https://github.com/swaggest/swac) | PHP, Go | Generates clients for Go and PHP from OpenAPI 2/3. |