docs: ABI: Drop trailing whitespace

Remove all trailing whitespace from the ABI documentation.
Most of it was introduced during recent updates.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20201110144033.3278499-1-geert+renesas@glider.beSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/ABI/testing/configfs-usb-gadget-ecm

@@ -7,7 +7,7 @@ Description:
 		ifname
 			      - network device interface name associated with
 				this function instance
-		qmult	
+		qmult
 			      - queue length multiplier for high and
 				super speed
 		host_addr

Documentation/ABI/testing/sysfs-devices-memory

@@ -19,7 +19,7 @@ Description:
 		identify removable sections of the memory before attempting
 		potentially expensive hot-remove memory operation
 Users:		hotplug memory remove tools
-		http://www.ibm.com/developerworks/wikis/display/LinuxP/powerpc-utils	
+		http://www.ibm.com/developerworks/wikis/display/LinuxP/powerpc-utils
 
 What:		/sys/devices/system/memory/memoryX/phys_device
 Date:		September 2008

Documentation/ABI/testing/sysfs-fs-ext4

@@ -33,7 +33,7 @@ What:		/sys/fs/ext4/<disk>/mb_order2_req
 Date:		March 2008
 Contact:	"Theodore Ts'o" <tytso@mit.edu>
 Description:
-		Tuning parameter which controls the minimum size for 
+		Tuning parameter which controls the minimum size for
 		requests (as a power of 2) where the buddy cache is
 		used
 

Documentation/ABI/testing/sysfs-module

@@ -25,7 +25,7 @@ Description:	Maximum time allowed for periodic transfers per microframe (μs)
 		  However there are cases, when 80% max isochronous bandwidth is
 		  too limiting. For example two video streams could require 110
 		  microseconds of isochronous bandwidth per microframe to work
-		  together. 
+		  together.
 
 		Through this setting it is possible to raise the limit so that
 		the host controller would allow allocating more than 100

Documentation/ABI/testing/sysfs-platform-renesas_usb3

@@ -12,6 +12,6 @@ Description:
 		- "peripheral" - switching mode from host to peripheral.
 
 		Read the file, then it shows the following strings:
-		
+
 		- "host" - The mode is host now.
 		- "peripheral" - The mode is peripheral now.