pw_env_setup: fix docgen

Change-Id: Ied941c3d0fcba6309f6e03611ad02e65a04ed2f4
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/46403
Pigweed-Auto-Submit: Ewout van Bekkum <ewout@google.com>
Reviewed-by: Alexei Frolov <frolv@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>

pw_env_setup/docs.rst

diff --git a/pw_env_setup/docs.rst b/pw_env_setup/docs.rst
index 06e3295..a3216d2 100644
--- a/pw_env_setup/docs.rst
+++ b/pw_env_setup/docs.rst
@@ -183,7 +183,7 @@
     "tags": [
       "version:2@1.16.3"
     ]
-  },
+  }
 
 ``virtualenv.gn_targets``
   Target for installing Python packages. Downstream projects will need to