polish exceptions and platforms (GH-9272)
diff --git a/Doc/library/asyncio-exceptions.rst b/Doc/library/asyncio-exceptions.rst
index bcd3599..7f3ed85 100644
--- a/Doc/library/asyncio-exceptions.rst
+++ b/Doc/library/asyncio-exceptions.rst
@@ -19,11 +19,12 @@
The operation has been cancelled.
- This exception can be caught to perform custom operations on
+ This exception can be caught to perform custom operations
when asyncio Tasks are cancelled. In almost all situations the
exception must always be re-raised.
.. note::
+
This exception is a subclass of :exc:`Exception`, so it can be
accidentally suppressed by ``try..except`` block::
@@ -54,7 +55,7 @@
.. exception:: SendfileNotAvailableError
- The "sendfile" syscall for is not available for the given
+ The "sendfile" syscall is not available for the given
socket or file type.
A subclass of :exc:`RuntimeError`.