build: touch tools/doc/node_modules after run
Currently, tools/doc/node_modules is not touched after running npm install resulting in npm install being run every time. I missed this while testing commit 88bff826 ("build: make tools/doc/node_modules non-phony").
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines