[PATCH] net: fix e1000.rst Documentation build errors

[Randy Dunlap <rdunlap@infradead.org>]

From: Randy Dunlap <rdunlap@infradead.org>

Fix Documentation build errors in e1000.rst.  Several section titles and
their underlines should not be indented.

Documentation/networking/e1000.rst:358: (SEVERE/4) Unexpected section title.

Fixes: 228046e76189 ("Documentation: e1000: Update kernel documentation")

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Cc: Aaron Brown <aaron.f.brown@intel.com>
---
Is there a Sphinx version problem here?  Tested-by: should indicate
that there was no error like I am seeing.

 Documentation/networking/e1000.rst |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

--- lnx-418-rc1.orig/Documentation/networking/e1000.rst
+++ lnx-418-rc1/Documentation/networking/e1000.rst
@@ -354,8 +354,8 @@ previously mentioned to force the adapte
 Additional Configurations
 =========================
 
-  Jumbo Frames
-  ------------
+Jumbo Frames
+------------
   Jumbo Frames support is enabled by changing the MTU to a value larger than
   the default of 1500.  Use the ifconfig command to increase the MTU size.
   For example::
@@ -389,8 +389,8 @@ Additional Configurations
      Intel(R) PRO/1000 Gigabit Server Adapter
      Intel(R) PRO/1000 PM Network Connection
 
-  ethtool
-  -------
+ethtool
+-------
   The driver utilizes the ethtool interface for driver configuration and
   diagnostics, as well as displaying statistical information.  The ethtool
   version 1.6 or later is required for this functionality.
@@ -398,8 +398,8 @@ Additional Configurations
   The latest release of ethtool can be found from
   https://www.kernel.org/pub/software/network/ethtool/
 
-  Enabling Wake on LAN* (WoL)
-  ---------------------------
+Enabling Wake on LAN* (WoL)
+---------------------------
   WoL is configured through the ethtool* utility.
 
   WoL will be enabled on the system during the next shut down or reboot.