Automatic port of System.Buffers docs (dotnet#4810)

Author: carlossanlop

xml/System.Buffers/SequenceReader`1.xml

@@ -968,11 +968,13 @@ This method copies a fixed amount of data out of the sequence if possible. It do
         <Parameter Name="advancePastDelimiter" Type="System.Boolean" Index="2" FrameworkAlternate="net-5.0" />
       </Parameters>
       <Docs>
-        <param name="sequence">To be added.</param>
-        <param name="delimiter">To be added.</param>
-        <param name="advancePastDelimiter">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="sequence">The read data, if any.</param>
+        <param name="delimiter">The delimiter to look for.</param>
+        <param name="advancePastDelimiter">
+          <see langword="true" /> to move past the <paramref name="delimiter" /> if found.</param>
+        <summary>Try to read everything up to the given <paramref name="delimiter" />.</summary>
+        <returns>
+          <see langword="true" /> if the <paramref name="delimiter" /> was found; otherwise, <see langword="false" />.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>