Document Half.op_Explicit APIs (dotnet#4893)

* Document Half.op_Explicit APIs

* Equals

Co-authored-by: carlossanlop <carlossanlop@users.noreply.github.com>

Author: carlossanlop

xml/System/Half.xml

@@ -148,7 +148,7 @@
         <Parameter Name="other" Type="System.Half" />
       </Parameters>
       <Docs>
-        <param name="other">To be added.</param>
+        <param name="other">A half-precision floating point number to compare to this instance.</param>
         <summary>Compares this instance for equality with <paramref name="other" />.</summary>
         <returns>
           <see langword="true" /> if the current object is equal to <paramref name="other" />; otherwise, <see langword="false" />.</returns>
@@ -174,7 +174,7 @@
         <Parameter Name="obj" Type="System.Object" />
       </Parameters>
       <Docs>
-        <param name="obj">To be added.</param>
+        <param name="obj">The object to compare to this instance.</param>
         <summary>Returns a value that indicates whether this instance is equal to the specified <paramref name="obj" />.</summary>
         <returns>
           <see langword="true" /> if <paramref name="obj" /> is an instance of <see cref="T:System.Half" /> and equals the value of this instance; otherwise, <see langword="false" />.</returns>
@@ -544,7 +544,7 @@
       <Docs>
         <param name="value">The double-precision floating point value to convert to <see cref="T:System.Half" />.</param>
         <summary>An explicit operator to convert a <see cref="T:System.Double" /> value to a <see cref="T:System.Half" />.</summary>
-        <returns>To be added.</returns>
+        <returns>The <see cref="T:System.Half" /> representation of the specified double-precision floating point <paramref name="value" />.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -569,7 +569,7 @@
       <Docs>
         <param name="value">The half-precision floating point value to convert to <see cref="T:System.Double" />.</param>
         <summary>An explicit operator to convert a <see cref="T:System.Half" /> value to a <see cref="T:System.Double" />.</summary>
-        <returns>To be added.</returns>
+        <returns>The <see cref="T:System.Double" /> representation of the specified half-precision floating point <paramref name="value" />.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -594,7 +594,7 @@
       <Docs>
         <param name="value">The half-precision floating point value to convert to <see cref="T:System.Single" />.</param>
         <summary>An explicit operator to convert a <see cref="T:System.Half" /> value to a <see cref="T:System.Single" />.</summary>
-        <returns>To be added.</returns>
+        <returns>The <see cref="T:System.Single" /> representation of the specified half-precision floating point <paramref name="value" />.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -619,7 +619,7 @@
       <Docs>
         <param name="value">The single-precision floating point value to convert to <see cref="T:System.Half" />.</param>
         <summary>An explicit operator to convert a <see cref="T:System.Single" /> value to a <see cref="T:System.Half" />.</summary>
-        <returns>To be added.</returns>
+        <returns>The <see cref="T:System.Half" /> representation of the specified single-precision floating point <paramref name="value" />.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>