Fix some typos.

lib/jsonrpc.py

@@ -145,7 +145,7 @@ class JSONRPC(asyncio.Protocol, LoggedClass):
         self.recv_size += len(data)
         self.using_bandwidth(len(data))
 
-        # Close abuvsive connections where buffered data exceeds limit
+        # Close abusive connections where buffered data exceeds limit
         buffer_size = len(data) + sum(len(part) for part in self.parts)
         if buffer_size > self.max_buffer_size:
             self.log_error('read buffer of {:,d} bytes exceeds {:,d} '

server/protocol.py

@@ -552,8 +552,8 @@ class Session(JSONRPC):
     '''Base class of ElectrumX JSON session protocols.
 
     Each session runs its tasks in asynchronous parallelism with other
-    sessions.  To prevent some sessions blocking othersr, potentially
-    long-running requests should yield (not yet implemented).
+    sessions.  To prevent some sessions blocking others, potentially
+    long-running requests should yield.
     '''
 
     def __init__(self, manager, bp, env, kind):