Documentation/networking: Update Intel Wired LAN docs

- Update the Intel Wired LAN documentation with the latest
  URL for ethtool.

- replace "Ethtool" with "ethtool"

Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Tested-by: Emil Tantilov <emil.s.tantilov@intel.com>
diff --git a/Documentation/networking/ixgbe.txt b/Documentation/networking/ixgbe.txt
index 9ade280..af77ed3 100644
--- a/Documentation/networking/ixgbe.txt
+++ b/Documentation/networking/ixgbe.txt
@@ -34,7 +34,7 @@
 optics and/or the direct attach cables listed below.
 
 When 82599-based SFP+ devices are connected back to back, they should be set to
-the same Speed setting via Ethtool. Results may vary if you mix speed settings.
+the same Speed setting via ethtool. Results may vary if you mix speed settings.
 82598-based adapters support all passive direct attach cables that comply
 with SFF-8431 v4.1 and SFF-8472 v10.4 specifications. Active direct attach
 cables are not supported.
@@ -110,7 +110,7 @@
 specified when a PAUSE frame is received.
 
 Flow Control is enabled by default. If you want to disable a flow control
-capable link partner, use Ethtool:
+capable link partner, use ethtool:
 
      ethtool -A eth? autoneg off RX off TX off
 
@@ -181,10 +181,10 @@
   -------
   The driver utilizes the ethtool interface for driver configuration and
   diagnostics, as well as displaying statistical information. The latest
-  Ethtool version is required for this functionality.
+  ethtool version is required for this functionality.
 
   The latest release of ethtool can be found from
-  http://sourceforge.net/projects/gkernel.
+  http://ftp.kernel.org/pub/software/network/ethtool/
 
   FCoE
   ----