Edit WSL2 install instructions
Edit WSL2 install instructions

Fix a typo "modules" in instructions.
Add instructions for cloning the WSL2-Linux-Kernel git repo.
Add sudo for `make modules_install` command.
Add instructions for renaming /lib/modules/x.y.z-microsoft-standard-WSL2+
even on recent kernels (needed this on 5.10).

iovisor/bcc,iovisor/bcc,iovisor/bcc,iovisor/bcc,iovisor/bcc