Remove duplicate wording (#11842)

Author: gewarren

xml/System/String.xml

@@ -12841,14 +12841,11 @@ Note that the method is called with the `options` argument set to <xref:System.S
         <param name="separator">A character that delimits the substrings in this instance.</param>
         <param name="count">The maximum number of elements expected in the array.</param>
         <param name="options">A bitwise combination of the enumeration values that specifies whether to trim substrings and include empty substrings.</param>
-        <summary>Splits a string into a maximum number of substrings based on a specified delimiting character and, optionally, options.
-        Splits a string into a maximum number of substrings based on the provided character separator, optionally omitting empty substrings from the result.</summary>
+        <summary>Splits a string into a maximum number of substrings based on the provided character separator, optionally omitting empty substrings from the result.</summary>
         <returns>An array that contains at most <paramref name="count" /> substrings from this instance that are delimited by <paramref name="separator" />.</returns>
         <remarks>
           <format type="text/markdown"><![CDATA[
 
-## Remarks
-
 If the string has already been split `count` - 1 times, but the end of the string has not been reached, then the last string in the returned array will contain this instance's remaining trailing substring, untouched.
 
           ]]></format>