In docs makefile: move declaration of CURRENT_PATH variable up, this was causing an error for me before

Author: Lisa Julia Nebel

python/sphinx_docs/Makefile

@@ -2,6 +2,6 @@
 
 # Build the documentation locally for the current branch
 # NOTE: You need to commit your changes before running this command
+CURRENT_BRANCH=$(shell git rev-parse --abbrev-ref HEAD)
 docs:
-	@CURRENT_BRANCH=$(shell git rev-parse --abbrev-ref HEAD)
-	sphinx-versioned -m $$CURRENT_BRANCH -b $$CURRENT_BRANCH --git-root ../../
+	sphinx-versioned -m ${CURRENT_BRANCH} -b ${CURRENT_BRANCH} --git-root ../../