Document System.DateTime.ParseExact method overloads that receive Spans (#3438)

Author: carlossanlop

xml/System/DateTime.xml

@@ -5405,12 +5405,12 @@ The following example demonstrates the <xref:System.DateTime.Parse%28System.Stri
         <Parameter Name="style" Type="System.Globalization.DateTimeStyles" Index="3" FrameworkAlternate="netcore-2.1;netcore-2.2;netcore-3.0;netstandard-2.1" />
       </Parameters>
       <Docs>
-        <param name="s">To be added.</param>
-        <param name="format">To be added.</param>
-        <param name="provider">To be added.</param>
-        <param name="style">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="s">A span containing the characters that represent a date and time to convert.</param>
+        <param name="format">A span containing the characters that represent a format specifier that defines the required format of <paramref name="s" />.</param>
+        <param name="provider">An object that supplies culture-specific formatting information about <paramref name="s" />.</param>
+        <param name="style">A bitwise combination of the enumeration values that provides additional information about <paramref name="s" />, about style elements that may be present in <paramref name="s" />, or about the conversion from <paramref name="s" /> to a <see cref="T:System.DateTime" /> value. A typical value to specify is <see cref="F:System.Globalization.DateTimeStyles.None" />.</param>
+        <summary>Converts the specified span representation of a date and time to its <see cref="T:System.DateTime" /> equivalent using the specified format, culture-specific format information, and style. The format of the string representation must match the specified format exactly or an exception is thrown.</summary>
+        <returns>An object that is equivalent to the date and time contained in <paramref name="s" />, as specified by <paramref name="format" />, <paramref name="provider" />, and <paramref name="style" />.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -5442,12 +5442,12 @@ The following example demonstrates the <xref:System.DateTime.Parse%28System.Stri
         <Parameter Name="style" Type="System.Globalization.DateTimeStyles" Index="3" FrameworkAlternate="netcore-2.1;netcore-2.2;netcore-3.0;netstandard-2.1" />
       </Parameters>
       <Docs>
-        <param name="s">To be added.</param>
-        <param name="formats">To be added.</param>
-        <param name="provider">To be added.</param>
-        <param name="style">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="s">A span containing the characters that represent a date and time to convert.</param>
+        <param name="formats">An array of allowable formats of <paramref name="s" />.</param>
+        <param name="provider">An object that supplies culture-specific format information about <paramref name="s" />.</param>
+        <param name="style">A bitwise combination of enumeration values that indicates the permitted format of <paramref name="s" />. A typical value to specify is <see cref="F:System.Globalization.DateTimeStyles.None" />.</param>
+        <summary>Converts the specified span representation of a date and time to its <see cref="T:System.DateTime" /> equivalent using the specified array of formats, culture-specific format information, and style. The format of the string representation must match at least one of the specified formats exactly or an exception is thrown.</summary>
+        <returns>An object that is equivalent to the date and time contained in <paramref name="s" />, as specified by <paramref name="formats" />, <paramref name="provider" />, and <paramref name="style" />.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>