Bump DavidAnson/markdownlint-cli2-action from 16.0.0 to 18.0.0 (open-telemetry#6027)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Mikel Blanchard <[email protected]>

Author: dependabot[bot]

.github/workflows/markdownlint.yml

@@ -14,7 +14,7 @@ jobs:
       uses: actions/checkout@v4
 
     - name: run markdownlint
-      uses: DavidAnson/markdownlint-cli2-action@v16.0.0
+      uses: DavidAnson/markdownlint-cli2-action@v18.0.0
       with:
         globs: |
           **/*.md

docs/trace/customizing-the-sdk/README.md

@@ -477,8 +477,8 @@ When using the `AddOpenTelemetry` & `WithTracing` extension methods the
 into an existing collection (typically the collection used is the one managed by
 the application host). The `TracerProviderBuilder` will be able to access all
 services registered into that collection. For lifecycle management, the
-`AddOpenTelemetry` registers an [IHostedService
-](https://learn.microsoft.com/dotnet/api/microsoft.extensions.hosting.ihostedservice)
+`AddOpenTelemetry` registers an
+[IHostedService](https://learn.microsoft.com/dotnet/api/microsoft.extensions.hosting.ihostedservice)
 which is used to automatically start the `TracerProvider` when the host starts
 and the host will automatically shutdown and dispose the `TracerProvider` when
 it is shutdown.