Fix #79871: On Windows, php can sleep only in 1ms steps

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@350174 c90b9560-bf6c-de11-be94-00142212c4b1

Author: cmb69

reference/misc/functions/time-nanosleep.xml

@@ -37,6 +37,12 @@
       <para>
        Must be a non-negative integer less than 1 billion.
       </para>
+      <note>
+       <simpara>
+        On Windows, the system may sleep longer that the given number of nanoseconds,
+        depending on the hardware.
+       </simpara>
+      </note>
      </listitem>
     </varlistentry>
    </variablelist>

reference/misc/functions/usleep.xml

@@ -28,6 +28,12 @@
        Halt time in microseconds. A microsecond is one millionth of a
        second.
       </para>
+      <note>
+       <simpara>
+        On Windows, the system may sleep longer that the given number of microseconds,
+        depending on the hardware.
+       </simpara>
+      </note>
      </listitem>
     </varlistentry>
    </variablelist>