[PATCH] docs: Expand documentation of $histchars[1]. Joint with Matthew Martin.

[Daniel Shahaf <d.s@daniel.shahaf.name>]

---
 Doc/Zsh/expn.yo    | 11 +++++++----
 Doc/Zsh/grammar.yo |  3 ++-
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/Doc/Zsh/expn.yo b/Doc/Zsh/expn.yo
index d5e5838df..1ea6ae47b 100644
--- a/Doc/Zsh/expn.yo
+++ b/Doc/Zsh/expn.yo
@@ -83,10 +83,11 @@ subsect(Overview)
 vindex(histchars, use of)
 A history expansion begins with the first character of the tt(histchars)
 parameter, which is `tt(!)' by default, and may occur anywhere on the
-command line; history expansions do not nest.  The `tt(!)' can be escaped
-with `tt(\)' or can be enclosed between a pair of single quotes (tt(''))
-to suppress its special meaning.  Double quotes will em(not) work for
-this.  Following this history character is an optional event designator
+command line, including inside double quotes (but not inside single quotes
+tt('...') or C-style quotes tt($'...')).  A literal `tt(!)' may be
+obtained by escaping it with a backslash.  
+
+The first character is followed by an optional event designator
 (ifzman(see )noderef(Event Designators)) and then an optional word
 designator (noderef(Word Designators)); if neither of these designators is
 present, no history expansion occurs.
@@ -96,6 +97,8 @@ but before any other expansions take place and before the command is
 executed.  It is this expanded form that is recorded as the history event
 for later references.
 
+History expansions do not nest.
+
 By default, a history reference with no event designator refers to the
 same event as any preceding history reference on that command line; if it
 is the only history reference in a command, it refers to the previous
diff --git a/Doc/Zsh/grammar.yo b/Doc/Zsh/grammar.yo
index f9600424e..d2c7cd29c 100644
--- a/Doc/Zsh/grammar.yo
+++ b/Doc/Zsh/grammar.yo
@@ -671,4 +671,5 @@ single quote if it is set.
 
 Inside double quotes (tt("")), parameter and
 command substitution occur, and `tt(\)' quotes the characters
-`tt(\)', `tt(`)', `tt(")', and `tt($)'.
+`tt(\)', `tt(`)', `tt(")', `tt($)', and the first character
+of tt($histchars) (default `tt(!)').