Fix some pre-existing warnings on unresolvable xrefs

Author: tannergooding

xml/System.Numerics/Vector.xml

@@ -2280,7 +2280,7 @@ Note that this method returns a <xref:System.Single> instead of an integral type
       </Parameters>
       <Docs>
         <param name="value">The vector to convert.</param>
-        <summary>Converts a <see cref="T:System.Numerics.Vector{System.Double}" /> to a <see cref="T:System.Numerics.Vector{System.Int64}" /> using platform specific behavior on overflow.</summary>
+        <summary>Converts a <see langword="System.Numerics.Vector&lt;System.Double&gt;" /> to a <see langword="System.Numerics.Vector&lt;System.Int64&gt;" /> using platform specific behavior on overflow.</summary>
         <returns>The converted vector.</returns>
         <remarks>To be added.</remarks>
       </Docs>
@@ -2440,7 +2440,7 @@ Note that this method returns a <xref:System.Single> instead of an integral type
       </Parameters>
       <Docs>
         <param name="value">The vector to convert.</param>
-        <summary>Converts a <see cref="T:System.Numerics.Vector{System.Single}" /> to a <see cref="T:System.Numerics.Vector{System.UInt32}" /> using platform specific behavior on overflow.</summary>
+        <summary>Converts a <see langword="System.Numerics.Vector&lt;System.Single&gt;" /> to a <see langword="System.Numerics.Vector&lt;System.UInt32&gt;" /> using platform specific behavior on overflow.</summary>
         <returns>The converted vector.</returns>
         <remarks>To be added.</remarks>
       </Docs>
@@ -2518,7 +2518,7 @@ Note that this method returns a <xref:System.Single> instead of an integral type
       </Parameters>
       <Docs>
         <param name="value">The vector to convert.</param>
-        <summary>Converts a <see cref="T:System.Numerics.Vector{System.Double}" /> to a <see cref="T:System.Numerics.Vector{System.UInt64}" /> using platform specific behavior on overflow.</summary>
+        <summary>Converts a <see langword="System.Numerics.Vector&lt;System.Double&gt;" /> to a <see langword="System.Numerics.Vector&lt;System.UInt64&gt;" /> using platform specific behavior on overflow.</summary>
         <returns>The converted vector.</returns>
         <remarks>To be added.</remarks>
       </Docs>