Fix PipeReader typo (dotnet#7459)

Author: mfkl

xml/System.IO.Pipelines/PipeReader.xml

@@ -489,7 +489,7 @@ The canceled <xref:System.IO.Pipelines.PipeReader.ReadAsync(System.Threading.Can
         <Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" Index="1" FrameworkAlternate="dotnet-plat-ext-6.0" />
       </Parameters>
       <Docs>
-        <param name="minimumSize">The minimum length that needs to be buffered in order to for the call to return.</param>
+        <param name="minimumSize">The minimum length that needs to be buffered in order for the call to return.</param>
         <param name="cancellationToken">The token to monitor for cancellation requests. The default value is <see langword="default" />.</param>
         <summary>Asynchronously reads a sequence of bytes from the current <see cref="T:System.IO.Pipelines.PipeReader" />.</summary>
         <returns>A <see cref="T:System.Threading.Tasks.ValueTask`1" /> representing the asynchronous read operation.</returns>
@@ -524,7 +524,7 @@ The call returns if the <xref:System.IO.Pipelines.PipeReader> has read the `mini
         <Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" Index="1" FrameworkAlternate="dotnet-plat-ext-6.0" />
       </Parameters>
       <Docs>
-        <param name="minimumSize">The minimum length that needs to be buffered in order to for the call to return.</param>
+        <param name="minimumSize">The minimum length that needs to be buffered in order for the call to return.</param>
         <param name="cancellationToken">The token to monitor for cancellation requests. The default value is <see langword="default" />.</param>
         <summary>Asynchronously reads a sequence of bytes from the current <see cref="T:System.IO.Pipelines.PipeReader" />.</summary>
         <returns>A <see cref="T:System.Threading.Tasks.ValueTask`1" /> representing the asynchronous read operation.</returns>