doc: Fix package name in external renderer example (#11170)

The py3-zmq package does not exist in alpine linux 3.11, used in both master and 1.11.4 . The py3-pyzmq package exists however:
https://pkgs.alpinelinux.org/packages?name=py3-pyzmq&branch=v3.11
release/v1.15
Johan Van de Wauw 2020-04-21 22:36:27 +02:00 committed by GitHub
parent 74cc3c5e18
commit dfca884b15
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@ -36,7 +36,7 @@ FROM gitea/gitea:{{< version >}}
COPY custom/app.ini /data/gitea/conf/app.ini
[...]
RUN apk --no-cache add asciidoctor freetype freetype-dev gcc g++ libpng python-dev py-pip python3-dev py3-pip py3-zmq
RUN apk --no-cache add asciidoctor freetype freetype-dev gcc g++ libpng python-dev py-pip python3-dev py3-pip py3-pyzmq
# install any other package you need for your external renderers
RUN pip3 install --upgrade pip