Programming guide, strings: updated Related Topics table

[pkulikov]

C# Programming Guide, strings topic, Related Topics table:

• missed link to the how-to on concatenation
• missed link to the string interpolation topic that looks like a fit to this table
• description of Parsing Strings was not correct
• How to: Convert a String to a DateTime topic redirects to the sub-topic of Parsing Strings (so, I've just renamed entry and updated the relative path)

[BillWagner]

Thanks for making these changes @pkulikov

We appreciate it. I'll now.
Thank you again.