Documentation: networking: device drivers: Remove stray asterisks

These asterisks were once references to a line that said:
  "* Other names and brands may be claimed as the property of others."
But now, they serve no purpose; they can only irritate the reader.

Fixes: de3edab4 ("e1000: update README for e1000")
Fixes: a3fb6568 ("e100.txt: Cleanup license info in kernel doc")
Fixes: da8c01c4 ("e1000e.txt: Add e1000e documentation")
Fixes: f12a84a9 ("Documentation: fm10k: Add kernel documentation")
Fixes: b55c52b1 ("igb.txt: Add igb documentation")
Fixes: c4e9b56e ("igbvf.txt: Add igbvf Documentation")
Fixes: d7064f4c ("Documentation/networking/: Update Intel wired LAN driver documentation")
Fixes: c4b8c011 ("ixgbevf.txt: Update ixgbevf documentation")
Fixes: 1e06edcc ("Documentation: i40e: Prepare documentation for RST conversion")
Fixes: 105bf2fe ("i40evf: add driver to kernel build system")
Fixes: 1fae869b ("Documentation: ice: Prepare documentation for RST conversion")
Fixes: df69ba43 ("ionic: Add basic framework for IONIC Network device driver")
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>