Fix typo in SRM package description (#63782)

Author: MSDN-WhiteKnight

src/libraries/System.Reflection.Metadata/src/System.Reflection.Metadata.csproj

@@ -6,7 +6,7 @@
     <TargetFrameworks>$(NetCoreAppCurrent);$(NetCoreAppMinimum);netstandard2.0;$(NetFrameworkMinimum)</TargetFrameworks>
     <Nullable>enable</Nullable>
     <IsPackable>true</IsPackable>
-    <PackageDescription>This packages provides a low-level .NET (ECMA-335) metadata reader and writer. It's geared for performance and is the ideal choice for building higher-level libraries that intend to provide their own object model, such as compilers.
+    <PackageDescription>This package provides a low-level .NET (ECMA-335) metadata reader and writer. It's geared for performance and is the ideal choice for building higher-level libraries that intend to provide their own object model, such as compilers.
 
 Commonly Used Types:
 System.Reflection.Metadata.MetadataReader