Remove linkcheck and doctest targets in doc/Makefile

Author: weiji14

doc/Makefile

@@ -38,17 +38,6 @@ api:
 serve:
 	cd $(BUILDDIR)/html && python -m http.server 8009
 
-linkcheck:
-	$(SPHINXBUILD) -b linkcheck $(ALLSPHINXOPTS) $(BUILDDIR)/linkcheck
-	@echo
-	@echo "Link check complete; look for any errors in the above output " \
-	      "or in $(BUILDDIR)/linkcheck/output.txt."
-
-doctest:
-	$(SPHINXBUILD) -b doctest $(ALLSPHINXOPTS) $(BUILDDIR)/doctest
-	@echo "Testing of doctests in the sources finished; look at the " \
-	      "results in $(BUILDDIR)/doctest/output.txt."
-
 clean:
 	rm -rf $(BUILDDIR)/doctrees
 	rm -rf $(BUILDDIR)/html