fix(make): clean was depending on unknown targets

There are no per-program-type docs clean, just made it depend on
docs-all-clean.

Also added the `docs-api|cli` target to the generated per-program-type
make help. It was just missing, even though it existed.

Makefile

@@ -1,4 +1,4 @@
-.PHONY: clean help deps regen-apis license ubuntu-build
+.PHONY: help deps regen-apis license ubuntu-build wheezy-build clean
 .SUFFIXES:
 
 VENV = .virtualenv/virtualenv.py
@@ -86,6 +86,6 @@ wheezy-build:
 
 regen-apis: | clean-all-api clean-all-cli gen-all-api gen-all-cli license
 
-clean: clean-all-api clean-all-cli
+clean: clean-all-api clean-all-cli docs-all-clean
 	-rm -Rf $(VENV_DIR)
 	-rm $(API_DEPS) $(CLI_DEPS)

src/mako/deps.mako

@@ -132,12 +132,7 @@ ${api_clean}:
 % endfor
 % endfor
 
-% if agsuffix not in ["-api", "-cli"]:
-clean-all${agsuffix}: ${space_join(1)} docs-clean${agsuffix}
-% else:
 clean-all${agsuffix}: ${space_join(1)}
-% endif
-
 cargo${agsuffix}: ${space_join(2)}
 publish${agsuffix}: | gen-all${agsuffix} ${space_join(4)}
 gen-all${agsuffix}: ${space_join(0)}
@@ -164,6 +159,7 @@ docs${agsuffix}: ${' '.join(central_api_index(util.library_to_crate_name(a[0]))
 
 help${agsuffix}:
 	$(info gen-all${agsuffix}       -   make all ${make.target_name})
+	$(info docs${agsuffix}          -   make all ${make.target_name} documentation)
 	$(info clean-all${agsuffix}     -   delete all generated ${make.target_name})
 	$(info cargo${agsuffix}         -   run cargo on all ${make.target_name}, use ARGS="args ..." to specify cargo arguments)
 	$(info publish${agsuffix}       -   run cargo publish on all ${make.target_name} and remember successful ones with marker files)