plugin/bufsize: remove trailing whitespace (#3444)

plugin/bufsize/README.md

@@ -3,7 +3,7 @@
 *bufsize* - sizes EDNS0 buffer size to prevent IP fragmentation.
 
 ## Description
-*bufsize* limits a requester's UDP payload size.  
+*bufsize* limits a requester's UDP payload size.
 It prevents IP fragmentation so that to deal with DNS vulnerability.
 
 ## Syntax
@@ -11,8 +11,8 @@ It prevents IP fragmentation so that to deal with DNS vulnerability.
 bufsize [SIZE]
 ```
 
-**[SIZE]** is an int value for setting the buffer size.  
-The default value is 512, and the value must be within 512 - 4096.  
+**[SIZE]** is an int value for setting the buffer size.
+The default value is 512, and the value must be within 512 - 4096.
 Only one argument is acceptable, and it covers both IPv4 and IPv6.
 
 ## Examples
@@ -36,4 +36,4 @@ Enable limiting the buffer size as an authoritative nameserver:
 
 ## Considerations
 - Setting 1232 bytes to bufsize may avoid fragmentation on the majority of networks in use today, but it depends on the MTU of the physical network links.
-- For now, if a client does not use EDNS, this plugin adds OPT RR.
+- For now, if a client does not use EDNS, this plugin adds OPT RR.
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