Add JOBS parameter to docs Makefile (#101395)

Author: christopheNan

Doc/Makefile

@@ -9,6 +9,7 @@ VENVDIR      = ./venv
 SPHINXBUILD  = PATH=$(VENVDIR)/bin:$$PATH sphinx-build
 SPHINXLINT   = PATH=$(VENVDIR)/bin:$$PATH sphinx-lint
 BLURB        = PATH=$(VENVDIR)/bin:$$PATH blurb
+JOBS         = auto
 PAPER        =
 SOURCES      =
 DISTVERSION  = $(shell $(PYTHON) tools/extensions/patchlevel.py)
@@ -18,7 +19,7 @@ SPHINXERRORHANDLING = -W
 PAPEROPT_a4     = -D latex_elements.papersize=a4paper
 PAPEROPT_letter = -D latex_elements.papersize=letterpaper
 
-ALLSPHINXOPTS = -b $(BUILDER) -d build/doctrees $(PAPEROPT_$(PAPER)) -j auto \
+ALLSPHINXOPTS = -b $(BUILDER) -d build/doctrees $(PAPEROPT_$(PAPER)) -j $(JOBS) \
                 $(SPHINXOPTS) $(SPHINXERRORHANDLING) . build/$(BUILDER) $(SOURCES)
 
 .PHONY: help