docs: remove submodules part from the install docs

[siemhesda]

BUG Description

Contrary to what the docs say under docs.npmjs.com/cli/v10/commands/npm-install

If the repository makes use of submodules, those submodules will be cloned as well.

Test results show that submodule cloning doesn't happen for (as in, docs are inaccurate for) npm 7 (v7.24.2), npm 8 (v8.19.4), npm 9 (v9.9.0), and npm latest/10 (v10.2.1).

This is an update to the docs in the meantime while waiting for the submodules to be brought back

References

Related to #2774

[wraithgar]

If this is a bug we intend to fix, updating the docs is not the correct approach.