Fix incorrect text in ResourceImporterWAV description

The descriptions for the edit/loop_begin and edit/loop_end members now
correctly state that the units are samples, rather than seconds.

doc/classes/ResourceImporterWAV.xml

@@ -17,10 +17,10 @@
 			[b]QOA ([url=https://qoaformat.org/]Quite OK Audio[/url]):[/b] Performs lossy compression on import. CPU cost is slightly higher than IMA-ADPCM, but quality is much higher.
 		</member>
 		<member name="edit/loop_begin" type="int" setter="" getter="" default="0">
-			The begin loop point to use when [member edit/loop_mode] is [b]Forward[/b], [b]Ping-Pong[/b] or [b]Backward[/b]. This is set in seconds after the beginning of the audio file.
+			The begin loop point to use when [member edit/loop_mode] is [b]Forward[/b], [b]Ping-Pong[/b], or [b]Backward[/b]. This is set in samples after the beginning of the audio file.
 		</member>
 		<member name="edit/loop_end" type="int" setter="" getter="" default="-1">
-			The end loop point to use when [member edit/loop_mode] is [b]Forward[/b], [b]Ping-Pong[/b] or [b]Backward[/b]. This is set in seconds after the beginning of the audio file. A value of [code]-1[/code] uses the end of the audio file as the end loop point.
+			The end loop point to use when [member edit/loop_mode] is [b]Forward[/b], [b]Ping-Pong[/b], or [b]Backward[/b]. This is set in samples after the beginning of the audio file. A value of [code]-1[/code] uses the end of the audio file as the end loop point.
 		</member>
 		<member name="edit/loop_mode" type="int" setter="" getter="" default="0">
 			Controls how audio should loop. This is automatically read from the WAV metadata on import.