Update StringToParse section

The information relating to the `DateTimeFormatInfo` object is important enough to call out earlier here in the docs...some of this information is later referenced only when referring to ParseExact, but this small addition is helpful to immediately note that the full DateTimeFormatInfo object is used as the default parsing, which would include formatting patterns.

Author: timheuer

xml/System/DateTime.xml

@@ -5091,7 +5091,7 @@ juillet 2009
 
 <a name="StringToParse"></a>   
 ### The string to parse  
- The <xref:System.DateTime.Parse%2A> method tries to convert the string representation of a date and time value to its <xref:System.DateTime> equivalent. It tries to parse the input string completely without throwing a <xref:System.FormatException> exception.  
+ The <xref:System.DateTime.Parse%2A> method tries to convert the string representation of a date and time value to its <xref:System.DateTime> equivalent. It tries to parse the input string completely without throwing a <xref:System.FormatException> exception.  The string is parsed using formatting information in the current <xref:System.Globalization.DateTimeFormatInfo> object, which is supplied implicitly by the current thread culture.
 
 > [!IMPORTANT]
 >  If the parsing operation fails because of an unrecognized string format, the <xref:System.DateTime.Parse%2A> method throws a <xref:System.FormatException>, whereas the <xref:System.DateTime.TryParse%2A> method returns `false`. Because exception handling can be expensive, you should use <xref:System.DateTime.Parse%2A> when the parsing operation is expected to succeed because the input source is trusted. <xref:System.DateTime.TryParse%2A> is preferable when parsing failures are likely, particularly because an input source is not trusted, or you have reasonable default values to substitute for strings that do not parse successfully.