text/template: clarify the default formatting used for values

Fixes #16105.

Change-Id: I94467f2adf861eb38f3119ad30d46a87456d5305
Reviewed-on: https://go-review.googlesource.com/24281Reviewed-by: Andrew Gerrand <adg@golang.org>

src/text/template/doc.go

@@ -74,8 +74,9 @@ data, defined in detail in the corresponding sections that follow.
 /*
 
 	{{pipeline}}
-		The default textual representation of the value of the pipeline
-		is copied to the output.
+		The default textual representation (the same as would be
+		printed by fmt.Print) of the value of the pipeline is copied
+		to the output.
 
 	{{if pipeline}} T1 {{end}}
 		If the value of the pipeline is empty, no output is generated;