modify Makefile (#256)

Makefile

@@ -2,23 +2,23 @@ JULIA:=julia
 
 default: help
 
-docs:
-	${JULIA} --project=docs -e 'using Pkg; Pkg.develop(PackageSpec(path=pwd())); Pkg.instantiate()'
-	${JULIA} --project=docs docs/make.jl
-
 format:
 	${JULIA} -e 'using JuliaFormatter; format(".")'
 
 test:
 	${JULIA} --project -e 'using Pkg; Pkg.resolve(); Pkg.test()'
 
+docs:
+	${JULIA} --project=docs -e 'using Pkg; Pkg.develop(PackageSpec(path=pwd())); Pkg.instantiate()'
+	${JULIA} --project=docs docs/make.jl
+
 all: format test docs
 
 help:
 	@echo "The following make commands are available:"
-	@echo " - make docs: instantiate and build the documentation"
 	@echo " - make format: format codes with JuliaFormatter"
 	@echo " - make test: run the tests"
-	@echo " - make all: run every commands above"
+	@echo " - make docs: instantiate and build the documentation"
+	@echo " - make all: run every commands in the above order"
 
-.PHONY: default docs format test all help
+.PHONY: default format test docs all help