[patch] Update template instantiation documentation

[Jonathan Wakely]

On 03/10/15 10:44 -0600, Sandra Loosemore wrote:
>Thanks for tackling this.  I remember thinking that this section 
>looked bit-rotted when I was reviewing the manual earlier this year.  
>Your patch looks like a step in the right direction, but can I get you 
>to fix a couple other things while you're at it?
>
>First, I think the reference to ancient ld versions is confusing, and 
>it would be better to rewrite that to emphasize that this is the 
>default behavior on most targets.  (I'd guess that anybody trying to 
>use a recent GCC release with an ld version from 1996 is going to run 
>into more critical blocking issues than this one.)  Maybe something 
>like:
>
>"G++ implements the Borland model on targets where the linker supports 
>it, including both ELF targets (such as GNU/Linux) and Microsoft 
>Windows.  Otherwise G++ implements neither automatic model."
>
>Second, if "Do nothing" is now the recommended way to handle this, 
>let's move that option to the front of the itemized list instead of 
>the end. Also, I'm confused by the "pretend" here; can we just delete 
>that sentence?

Yes, all good ideas, I'll incorporate these asap.