[release/v1.1] dont run docs workflows on release branches (envoyprox…

…y#4755) (envoyproxy#4759)

dont run docs workflows on release branches (envoyproxy#4755)

Docs are based off `main`


(cherry picked from commit f8c7056)

Signed-off-by: Arko Dasgupta <arko@tetrate.io>

.github/workflows/docs.yaml

@@ -3,14 +3,12 @@ on:
   push:
     branches:
     - "main"
-    - "release/v*"
     paths:
     - 'site/**'
     - 'tools/make/docs.mk'
   pull_request:
     branches:
     - "main"
-    - "release/v*"
     paths:
     - 'site/**'
     - 'tools/make/docs.mk'