Update custom-collector.md (#5304)

Co-authored-by: Tiffany Hrabusa <[email protected]>

Author: RichardChukwu

content/en/docs/collector/custom-collector.md

@@ -164,6 +164,13 @@ processors:
 receivers:
   - gomod:
       go.opentelemetry.io/collector/receiver/otlpreceiver {{% version-from-registry collector-receiver-otlp %}}
+
+providers:
+  - gomod: go.opentelemetry.io/collector/confmap/provider/envprovider v1.16.0
+  - gomod: go.opentelemetry.io/collector/confmap/provider/fileprovider v1.16.0
+  - gomod: go.opentelemetry.io/collector/confmap/provider/httpprovider v0.110.0
+  - gomod: go.opentelemetry.io/collector/confmap/provider/httpsprovider v0.110.0
+  - gomod: go.opentelemetry.io/collector/confmap/provider/yamlprovider v0.110.0
 ```
 
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