ported r77924 [Note Rd2latex encoding] from trunk

git-svn-id: https://svn.r-project.org/R/branches/R-3-6-branch@77925 00db46b3-68df-0310-9c12-caf00c1e9a41
diff --git a/src/library/tools/man/Rd2HTML.Rd b/src/library/tools/man/Rd2HTML.Rd
index efbb380..a572e08 100644
--- a/src/library/tools/man/Rd2HTML.Rd
+++ b/src/library/tools/man/Rd2HTML.Rd
@@ -1,6 +1,6 @@
 % File src/library/tools/man/Rd2HTML.Rd
 % Part of the R package, https://www.R-project.org
-% Copyright 2008-2016 R Core Team
+% Copyright 2008-2020 R Core Team
 % Distributed under GPL 2 or later
 
 \name{Rd2HTML}
@@ -76,12 +76,9 @@
   links are looked in them in turn, so lazy-evaluation can be used to
   only do a second-level search for links if required.
 
-  Note that the default for \code{Rd2latex} is to output ASCII,
-  including using the second option of \verb{\enc} markup.  This was
-  chosen because use of UTF-8 in LaTeX requires version
-  \sQuote{2005/12/01} or later, and even with that version the coverage
-  of UTF-8 glyphs is not extensive (and not even as complete as
-  Latin-1).
+  Before \R 3.6.0, the default for \code{Rd2latex} was \code{outputEncoding = "ASCII"},
+  including using the second option of \verb{\enc} markup, because \LaTeX
+  versions did not provide enough coverage of UTF-8 glyphs for a long time.
 
   \code{Rd2txt} will format text paragraphs to a width determined by
   \code{width}, with appropriate margins.  The default is to be close to