rename verify-build-type target to verify-build-revision

Handbook/GNUmakefile

@@ -246,8 +246,8 @@ prepare-dest:
 prepare-src:
 	@echo "Preparing the handbook source dir $(SG_MDBOOK_SRC_DIR)..."
 
-.PHONY: verify-build-type
-verify-build-type:
+.PHONY: verify-build-revision
+verify-build-revision:
 ifeq ($(SG_HANDBOOK_REVISION), next)
 	@echo "Building an unstable handbook for the next release..."
 else # ($(SG_HANDBOOK_REVISION), next)
@@ -304,10 +304,10 @@ serve:
 build: info
 build: install-build-deps
 build: prepare
-build: verify-build-type
+build: verify-build-revision
 build:
 
 .PHONY: deploy
 deploy: clean
 deploy: build
-deploy:
+deploy: