[PATCH] Clarifying "hash" and "whence" documentation

[Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>]

See users/28295 and users/28296

diff --git a/Doc/Zsh/builtins.yo b/Doc/Zsh/builtins.yo
index dd54a0fc8..b6217f66d 100644
--- a/Doc/Zsh/builtins.yo
+++ b/Doc/Zsh/builtins.yo
@@ -1052,9 +1052,11 @@ The choice of hash table to work on is determined by the tt(-d) option;
 without the option the command hash table is used, and with the option the
 named directory hash table is used.
 
-A command var(name) starting with a tt(/) is never hashed, whether by
-explicit use of the tt(hash) command or otherwise.  Such a command
-is always found by direct look up in the file system.
+A command var(name) starting with a tt(/) or with a relative path
+starting with tt(./) or tt(../) is never executed by lookup in
+the command hash table, and these can only be added to the table by
+explicit use of the tt(hash) command.  Such a command is always
+found by direct look up in the file system.
 
 Given no arguments, and neither the tt(-r) or tt(-f) options,
 the selected hash table will be listed in full.
@@ -1063,9 +1065,11 @@ The tt(-r) option causes the selected hash table to be emptied.
 It will be subsequently rebuilt in the normal fashion.
 The tt(-f) option causes the selected hash table to be fully
 rebuilt immediately.  For the command hash table this hashes
-all the absolute directories in the tt(PATH),
-and for the named directory hash table this adds all users' home directories.
+all (and em(only)) the absolute directories in the tt(PATH),
+and for the named directory hash table this adds all users' home
+directories.
 These two options cannot be used with any arguments.
+Both options remove any explicitly-added elements.
 
 The tt(-m) option causes the arguments to be taken as patterns
 (which should be quoted) and the elements of the hash table
@@ -2523,11 +2527,14 @@ item(tt(-a))(
 Do a search for all occurrences of var(name)
 throughout the command path.
 Normally only the first occurrence is printed.
+When combined with tt(-m), only names appearing in the command hash
+table are searched, but all occurrences of those names are printed.
 )
 item(tt(-m))(
 The arguments are taken as patterns (pattern characters should be
-quoted), and the information is displayed for each command matching one
-of these patterns.
+quoted), and the information is displayed for each entry in the command
+hash table matching one of these patterns.  The hash table is first
+refilled, in case of changes to tt(PATH).
 )
 item(tt(-s))(
 If a pathname contains symlinks, print the symlink-free pathname as well.
diff --git a/Doc/Zsh/params.yo b/Doc/Zsh/params.yo
index b543d1c38..2a30085a8 100644
--- a/Doc/Zsh/params.yo
+++ b/Doc/Zsh/params.yo
@@ -1414,6 +1414,7 @@ An array (colon-separated list)
 of directories to search for commands.
 When this parameter is set, each directory is scanned
 and all files found are put in a hash table.
+Directories named by relative path are not scanned for hashing.
 )
 vindex(POSTEDIT)
 item(tt(POSTEDIT) <S>)(