[chore][receiver/sqlserver] Update documentation for darwin and linux…

… OS (#32878)

**Description:** <Describe what has changed.>
<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
With the enhancement in
#30297,
the SQL Server receiver can now run on MacOS and Linux, since it no
longer solely relies on Windows. The difference in functionality has
(hopefully) been documented clearly between the different platforms, so
the unsupported warning can be removed. I missed this in my previous
PRs.

receiver/sqlserverreceiver/README.md

@@ -4,7 +4,6 @@
 | Status        |           |
 | ------------- |-----------|
 | Stability     | [beta]: metrics   |
-| Unsupported Platforms | darwin, linux |
 | Distributions | [contrib] |
 | Issues        | [![Open issues](https://img.shields.io/github/issues-search/open-telemetry/opentelemetry-collector-contrib?query=is%3Aissue%20is%3Aopen%20label%3Areceiver%2Fsqlserver%20&label=open&color=orange&logo=opentelemetry)](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aopen+is%3Aissue+label%3Areceiver%2Fsqlserver) [![Closed issues](https://img.shields.io/github/issues-search/open-telemetry/opentelemetry-collector-contrib?query=is%3Aissue%20is%3Aclosed%20label%3Areceiver%2Fsqlserver%20&label=closed&color=blue&logo=opentelemetry)](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aclosed+is%3Aissue+label%3Areceiver%2Fsqlserver) |
 | [Code Owners](https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/CONTRIBUTING.md#becoming-a-code-owner)    | [@djaglowski](https://www.github.com/djaglowski), [@StefanKurek](https://www.github.com/StefanKurek) \| Seeking more code owners! |

receiver/sqlserverreceiver/metadata.yaml

@@ -9,7 +9,6 @@ status:
   codeowners:
     active: [djaglowski, StefanKurek]
     seeking_new: true
-  unsupported_platforms: [darwin, linux]
 
 resource_attributes:
   sqlserver.database.name: