Fix suppression example errors in README

Fixes #1592

Author: rjmholt

README.md

@@ -299,13 +299,13 @@ function start-bam {
 
 Suppress violations in all the functions:
 ``` PowerShell
-[Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSAvoidUsingWriteHost', Scope='Function', Target='*')]
+[Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSAvoidUsingWriteHost', '', Scope='Function', Target='*')]
 Param()
 ```
 
 Suppress violation in `start-bar`, `start-baz` and `start-bam` but not in `start-foo`:
 ``` PowerShell
-[Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSAvoidUsingWriteHost', Scope='Function', Target='start-b*')]
+[Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSAvoidUsingWriteHost', '', Scope='Function', Target='start-b*')]
 Param()
 ```