docs: fix link to two's complement wiki page

Signed-off-by: Emmanuel Ferdman <[email protected]>

doc/classes/int.xml

@@ -390,7 +390,7 @@
 		<operator name="operator ~">
 			<return type="int" />
 			<description>
-				Performs the bitwise [code]NOT[/code] operation on the [int]. Due to [url=https://en.wikipedia.org/wiki/Two%27s_complement/]2's complement[/url], it's effectively equal to [code]-(int + 1)[/code].
+				Performs the bitwise [code]NOT[/code] operation on the [int]. Due to [url=https://en.wikipedia.org/wiki/Two%27s_complement]2's complement[/url], it's effectively equal to [code]-(int + 1)[/code].
 				[codeblock]
 				print(~4) # Prints -5
 				print(~(-7)) # Prints 6