tools: fix gitignore for tools/doc/

PR-URL: #17224
Fixes: #17216
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

Author: RichardLitt

Makefile

@@ -591,7 +591,7 @@ available-node = \
 		exit 1; \
 	fi;
 
-run-npm-install = $(PWD)/$(NPM) install
+run-npm-install = $(PWD)/$(NPM) install --production
 
 tools/doc/node_modules/js-yaml/package.json:
 	cd tools/doc && $(call available-node,$(run-npm-install))

tools/doc/node_modules/.bin/marked

@@ -7,10 +7,11 @@
     "node": ">=6"
   },
   "dependencies": {
-    "marked": "^0.3.5",
+    "marked": "^0.3.5"
+  },
+  "devDependencies": {
     "js-yaml": "^3.5.2"
   },
-  "devDependencies": {},
   "optionalDependencies": {},
   "bin": "./generate.js"
 }