docs: networking: device_drivers: replace some characters

The conversion tools used during DocBook/LaTeX/html/Markdown->ReST
conversion and some cut-and-pasted text contain some characters that
aren't easily reachable on standard keyboards and/or could cause
troubles when parsed by the documentation build system.

Replace the occurences of the following characters:

	- U+00a0 (' '): NO-BREAK SPACE
	  as it can cause lines being truncated on PDF output
Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/9bd9f5c067c4b068a974730a14fe8d68e1be0c9a.1623826294.git.mchehab+huawei@kernel.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/networking/device_drivers/ethernet/intel/i40e.rst

@@ -466,7 +466,7 @@ network. PTP support varies among Intel devices that support this driver. Use
 "ethtool -T <netdev name>" to get a definitive list of PTP capabilities
 supported by the device.
 
-IEEE 802.1ad (QinQ) Support
+IEEE 802.1ad (QinQ) Support
 ---------------------------
 The IEEE 802.1ad standard, informally known as QinQ, allows for multiple VLAN
 IDs within a single Ethernet frame. VLAN IDs are sometimes referred to as
@@ -523,8 +523,8 @@ of a port's bandwidth (should it be available). The sum of all the values for
 Maximum Bandwidth is not restricted, because no more than 100% of a port's
 bandwidth can ever be used.
 
-NOTE: X710/XXV710 devices fail to enable Max VFs (64) when Multiple Functions
-per Port (MFP) and SR-IOV are enabled. An error from i40e is logged that says
+NOTE: X710/XXV710 devices fail to enable Max VFs (64) when Multiple Functions
+per Port (MFP) and SR-IOV are enabled. An error from i40e is logged that says
 "add vsi failed for VF N, aq_err 16". To workaround the issue, enable less than
 64 virtual functions (VFs).
 

Documentation/networking/device_drivers/ethernet/intel/iavf.rst

@@ -113,7 +113,7 @@ which the AVF is associated. The following are base mode features:
 - AVF device ID
 - HW mailbox is used for VF to PF communications (including on Windows)
 
-IEEE 802.1ad (QinQ) Support
+IEEE 802.1ad (QinQ) Support
 ---------------------------
 The IEEE 802.1ad standard, informally known as QinQ, allows for multiple VLAN
 IDs within a single Ethernet frame. VLAN IDs are sometimes referred to as