Add otelcol_version (#5905)

Signed-off-by: Swapnil <[email protected]>

Author: meswapnilk

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

@@ -125,6 +125,7 @@ dist:
   name: otelcol-dev
   description: Basic OTel Collector distribution for Developers
   output_path: ./otelcol-dev
+  otelcol_version: 0.114.0
 ```
 
 Now you need to add the modules representing the components you want to be