Fix docs duplicate WOODPECKER_HOST assignment (woodpecker-ci#2501)

Seems to only be a small typo on https://woodpecker-ci.org/docs/administration/setup#docker-compose, where the `+ - WOODPECKER_HOST=${WOODPECKER_HOST}` line is repeated!
mzampetakis · Sep 26, 2023 · 0eacbe8 · 0eacbe8
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diff --git a/docs/versioned_docs/version-1.0/30-administration/00-setup.md b/docs/versioned_docs/version-1.0/30-administration/00-setup.md
@@ -93,7 +93,6 @@ services:
     environment:
       - [...]
 +     - WOODPECKER_HOST=${WOODPECKER_HOST}
-+     - WOODPECKER_HOST=${WOODPECKER_HOST}
 ```
 
 Woodpecker can also have its port's configured. It uses a separate port for gRPC and for HTTP. The agent performs gRPC calls and connects to the gRPC port.