Tweaks to exception details

This clarifies that even NRE, DivideByZeroException etc counts as
the exception being thrown.

Author: jskeet

standard/exceptions.md

@@ -6,10 +6,10 @@ Exceptions in C# provide a structured, uniform, and type-safe way of handling bo
 
 ## 21.2 Causes of exceptions
 
-Exception can be thrown in two different ways.
+Exceptions can be thrown in two different ways.
 
 - A `throw` statement ([§13.10.6](statements.md#13106-the-throw-statement)) throws an exception immediately and unconditionally. Control never reaches the statement immediately following the `throw`.
-- Certain exceptional conditions that arise during the processing of C# statements and expression cause an exception in certain circumstances when the operation cannot be completed normally. See [§21.5](exceptions.md#215-common-exception-classes) for a list of the various exceptions that can occur in this way.  
+- Certain exceptional conditions that arise during the processing of C# statements and expressions cause an exception to be thrown in certain circumstances when the operation cannot be completed normally. See [§21.5](exceptions.md#215-common-exception-classes) for a list of the various exceptions that can be thrown in this way.  
     > *Example*: An integer division operation ([§12.10.3](expressions.md#12103-division-operator)) throws a `System.DivideByZeroException` if the denominator is zero. *end example*
 
 ## 21.3 The System.Exception class