Add missing word (#10995)

Author: gewarren

xml/System.Buffers/ReadOnlySequence`1.xml

@@ -1074,7 +1074,7 @@
         <param name="position">The current sequence position.</param>
         <param name="memory">A read-only memory span that contains the next segment after <paramref name="position" />.</param>
         <param name="advance">
-          <see langword="true" /> if <paramref name="position" /> should to the beginning of next segment; otherwise, <see langword="false" />.</param>
+          <see langword="true" /> if <paramref name="position" /> should advance to the beginning of the next segment; otherwise, <see langword="false" />.</param>
         <summary>Tries to retrieve the next segment after <paramref name="position" /> and returns a value that indicates whether the operation succeeded.</summary>
         <returns>Returns <see langword="true" /> if the method returned the next segment, or <see langword="false" /> if the end of the read-only sequence was reached.</returns>
         <remarks>To be added.</remarks>