Update code comment

htdocs/core/lib/admin.lib.php

@@ -43,7 +43,10 @@ function versiontostring($versionarray)
 
 /**
  *	Compare 2 versions (stored into 2 arrays).
- *  For example, to check if Dolibarr version is lower than (x,y,z), do "if versioncompare(versiondolibarrarray(), array(x.y.z)) <= 0"
+ *  To check if Dolibarr version is lower than (x,y,z), do "if versioncompare(versiondolibarrarray(), array(x.y.z)) <= 0"
+ *  For example: if (versioncompare(versiondolibarrarray(),array(4,0,-4)) >= 0) is true if version is 4.0 beta or higher.
+ *  For example: if (versioncompare(versiondolibarrarray(),array(4,0,0)) >= 0) is true if version is 4.0 final or higher.
+ *  For example: if (versioncompare(versiondolibarrarray(),array(4,0,1)) >= 0) is true if version is 4.0.1 or higher.
  *
  *	@param      array		$versionarray1      Array of version (vermajor,verminor,patch)
  *	@param      array		$versionarray2		Array of version (vermajor,verminor,patch)