doc: remove the suffix number of the anchor link
Remove the number '11' as the suffix anchor id for the 'Developer's Certificate of Origin 1.1'.
Ref: https://github.com/nodejs/node/pull/6257
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make -j4 test (UNIX), or vcbuild test (Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines