Docs: LM 2 Tutorial: add more on whitespace

 - emphasise need for whitespace to separate syntactic
   elements

diff --git a/Documentation/user/tutorial.itely b/Documentation/user/tutorial.itely
index 86836d02abf35af9255f43adb243103fd551939b..f5c20df99596a69f176c9bff63a8d43a6b426417 100644 (file)
--- a/Documentation/user/tutorial.itely
+++ b/Documentation/user/tutorial.itely
@@ -503,7 +503,7 @@ Notes are lower case: @w{@code{@{ c d e @}}} is valid input;
 
 @item
 @strong{Whitespace insensitive}:
-it does not matter how many spaces (or new lines) you add.
+it does not matter how many spaces (or tabs or new lines) you add.
 @w{@code{@{ c d e @}}} means the same thing as
 @w{@code{@{ c @tie{}} @tie{} @tie{} d e @}} and:
 
@@ -522,6 +522,13 @@ thumb is to indent code blocks with either a tab or two spaces:
 @}
 @end example
 
+However, whitespace @emph{is} required to separate many syntactical
+elements from others.  In other words, whitespace can always be
+@emph{added}, but it cannot be @emph{eliminated}.  As missing
+whitespace can give rise to strange errors it is advisable to
+always insert whitespace before and after every syntactic element,
+for example, before and after every curly brace.
+
 @item
 @strong{Expressions}:
 every piece of LilyPond input needs to have @strong{@{ curly