Fix typo in patterns.md (#7194)

proposals/csharp-8.0/patterns.md

@@ -157,7 +157,7 @@ designations
     ;
 ```
 
-If the *designation* is a *simple_designation*, an expression *e* matches the pattern. In other words, a match to a *var pattern* always succeeds with a *simple_designation*. If the *simple_designation* is a *single_variable_designation*, the value of *e* is bounds to a newly introduced local variable. The type of the local variable is the static type of *e*.
+If the *designation* is a *simple_designation*, an expression *e* matches the pattern. In other words, a match to a *var pattern* always succeeds with a *simple_designation*. If the *simple_designation* is a *single_variable_designation*, the value of *e* is bound to a newly introduced local variable. The type of the local variable is the static type of *e*.
 
 If the *designation* is a *tuple_designation*, then the pattern is equivalent to a *positional_pattern* of the form `(var` *designation*, ... `)` where the *designation*s are those found within the *tuple_designation*.  For example, the pattern `var (x, (y, z))` is equivalent to `(var x, (var y, var z))`.