Update rules/Proj0810.md

Co-authored-by: Wesley Baartman <[email protected]>

Author: Corniel

rules/Proj0810.md

@@ -7,5 +7,5 @@ ancestor: Rules
 When using [Central Package Management](Proj0800.md) the central
 `Directory.Packages.props` contains `<PackageVersion>`s for all
 `<PackageRefence>`s in the solution. To reduce noise, this rule reports on
-`<PackageVersion`'s that are (not longer) referenced. This rule requires a
+`<PackageVersion`s that are (no longer) referenced. This rule requires a
 [`.net.csproj` SDK project](../general/sdk.md) to work.