Merge pull request #1226 from PrzemyslawKlys/patch-1

Update PossibleIncorrectComparisonWithNull.md

Author: JamesWTruher

RuleDocumentation/PossibleIncorrectComparisonWithNull.md

@@ -7,7 +7,7 @@
 To ensure that PowerShell performs comparisons correctly, the `$null` element should be on the left side of the operator.
 
 There are a number of reasons why this should occur:
-* `$null` is a scalar. When the input (left side) to an operator is a scalar value, comparison operators return a Boolean value. When the input is a collection of values, the comparison operators return any matching values, or an empty array if there are no matches in the collection. The only way to reliably check if a value is `$null` is to place `$null` on the left side of the operator so that a scalar comparison is perfomed.
+* `$null` is a scalar. When the input (left side) to an operator is a scalar value, comparison operators return a Boolean value. When the input is a collection of values, the comparison operators return any matching values, or an empty array if there are no matches in the collection. The only way to reliably check if a value is `$null` is to place `$null` on the left side of the operator so that a scalar comparison is performed.
 * PowerShell will perform type casting left to right, resulting in incorrect comparisons when `$null` is cast to other scalar types.
 
 ## How