Update Timer.xml for consistency (#4496)

* Update Timer.xml for consistency

int and long use the terms milliseconds and values (0) or (-1) where as `TimeSpan` overload reference `System.TimeSpan.Zero` or `Timeout.Infinite`.

* Update Timer.xml

Fixed a few typos

* Update Timer.xml

Fixed a few typos

* Update Timer.xml

Ooops

* Update Timer.xml

few more places I missed

* Update Timer.xml

oops

* Update Timer.xml

oops

* Update Timer.xml

double wording

* Update Timer.xml

Reverted 247-248.

Other suggestions hopefully done correctly this time.

* Update Timer.xml

Yea I saw ghost :p

* Update Timer.xml

Never saw the sequel https://www.imdb.com/title/tt2623408/

* Update Timer.xml

Could I waste any more of his time...

Author: Julius R Friedman

xml/System.Threading/Timer.xml

@@ -386,8 +386,8 @@ Sub TimerCallback(state As Object)
       <Docs>
         <param name="callback">A delegate representing a method to be executed.</param>
         <param name="state">An object containing information to be used by the callback method, or <see langword="null" />.</param>
-        <param name="dueTime">The amount of time to delay before the <paramref name="callback" /> parameter invokes its methods. Specify negative one (-1) milliseconds to prevent the timer from starting. Specify zero (0) to start the timer immediately.</param>
-        <param name="period">The time interval between invocations of the methods referenced by <paramref name="callback" />. Specify negative one (-1) milliseconds to disable periodic signaling.</param>
+        <param name="dueTime">The amount of time to delay before the <paramref name="callback" /> is invoked. Specify <see cref="F:System.Threading.Timeout.InfiniteTimeSpan" /> to prevent the timer from starting. Specify <see cref="F:System.TimeSpan.Zero" /> to start the timer immediately.</param>
+        <param name="period">The time interval between invocations of <paramref name="callback" />. Specify <see cref="F:System.Threading.Timeout.InfiniteTimeSpan" /> to disable periodic signaling.</param>
         <summary>Initializes a new instance of the <see langword="Timer" /> class, using <see cref="T:System.TimeSpan" /> values to measure time intervals.</summary>
         <remarks>
           <format type="text/markdown"><![CDATA[  
@@ -716,8 +716,8 @@ Sub TimerCallback(state As Object)
         <Parameter Name="period" Type="System.TimeSpan" />
       </Parameters>
       <Docs>
-        <param name="dueTime">A <see cref="T:System.TimeSpan" /> representing the amount of time to delay before invoking the callback method specified when the <see cref="T:System.Threading.Timer" /> was constructed. Specify negative one (-1) milliseconds to prevent the timer from restarting. Specify zero (0) to restart the timer immediately.</param>
-        <param name="period">The time interval between invocations of the callback method specified when the <see cref="T:System.Threading.Timer" /> was constructed. Specify negative one (-1) milliseconds to disable periodic signaling.</param>
+        <param name="dueTime">A <see cref="T:System.TimeSpan" /> representing the amount of time to delay before invoking the callback method specified when the <see cref="T:System.Threading.Timer" /> was constructed. Specify <see cref="F:System.Threading.Timeout.InfiniteTimeSpan" /> to prevent the timer from restarting. Specify <see cref="F:System.TimeSpan.Zero" /> to restart the timer immediately.</param>
+        <param name="period">The time interval between invocations of the callback method specified when the <see cref="T:System.Threading.Timer" /> was constructed. Specify <see cref="F:System.Threading.Timeout.InfiniteTimeSpan" /> to disable periodic signaling.</param>
         <summary>Changes the start time and the interval between method invocations for a timer, using <see cref="T:System.TimeSpan" /> values to measure time intervals.</summary>
         <returns>
           <see langword="true" /> if the timer was successfully updated; otherwise, <see langword="false" />.</returns>
@@ -727,9 +727,9 @@ Sub TimerCallback(state As Object)
 ## Remarks  
  The callback method is invoked once after `dueTime` elapses, and thereafter each time the time interval specified by `period` elapses.  
   
- If `dueTime` is zero (0), the callback method is invoked immediately. If `dueTime` is negative one (-1) milliseconds, the callback method is never invoked; the timer is disabled, but can be re-enabled by calling <xref:System.Threading.Timer.Change%2A> and specifying a positive value for `dueTime`.  
+ If `dueTime` is <xref cref="F:System.TimeSpan.Zero?displayProperty=nameWithType" />, the callback method is invoked immediately. If `dueTime` is <see cref="F:System.Threading.Timeout.InfiniteTimeSpan" />, the callback method is never invoked; the timer is disabled, but can be re-enabled by calling <xref:System.Threading.Timer.Change%2A> and specifying a positive value for `dueTime`.  
   
- If `period` is zero (0) or negative one (-1) milliseconds, and `dueTime` is positive, the callback method is invoked once; the periodic behavior of the timer is disabled, but can be re-enabled by calling <xref:System.Threading.Timer.Change%2A> and specifying a value greater than zero for `period`.  
+ If `period` is <xref cref="F:System.TimeSpan.Zero?displayProperty=nameWithType" /> or <see cref="F:System.Threading.Timeout.InfiniteTimeSpan" />, and `dueTime` is positive, the callback method is invoked once; the periodic behavior of the timer is disabled, but can be re-enabled by calling <xref:System.Threading.Timer.Change%2A> and specifying a value greater than zero for `period`.  
   
  The <xref:System.Threading.Timer.Change%2A> method can be called from the <xref:System.Threading.TimerCallback> delegate.