tacme(1): update man page to note -a trimming trailing spaces on Put - plan9port - [fork] Plan 9 from user space

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commit f264bbcdf6da8ea784cf1342b9583d34944fef0c

parent d9057521e665e1564e38b93ae1fafb53c81cb5d1

Author: Russ Cox 

Date:   Mon,  6 Jan 2020 15:26:25 -0500

acme(1): update man page to note -a trimming trailing spaces on Put

Diffstat:
  M man/man1/acme.1                     |      17 +++++++++++------

1 file changed, 11 insertions(+), 6 deletions(-)
---

diff --git a/man/man1/acme.1 b/man/man1/acme.1

t@@ -129,7 +129,7 @@ hold button 3 down near the top of the scroll bar.  Moving the mouse
 down the scroll bar speeds up the rate of scrolling.
 (The experimental option
 .B -r
-reverses the scrolling behavior of buttons 1 and 3, to behave 
+reverses the scrolling behavior of buttons 1 and 3, to behave
 more like
 .IR xterm (1).)
 .SS Layout
t@@ -193,10 +193,15 @@ When a window is in autoindent mode
 (see the
 .B Indent
 command below) and a newline character is typed,
-acme copies leading white space on the current line to the new line.
+.I acme
+copies leading white space on the current line to the new line,
+and when a window is
+.BR Put ,
+.I acme
+removes all trailing end-of-line white space before writing the file.
 The option
 .B -a
-causes each window to start in 
+causes each window to start in
 autoindent mode.
 .SS "Directory context
 Each window's tag names a directory: explicitly if the window
t@@ -406,7 +411,7 @@ command.
 .B Local
 In the Plan 9
 .IR acme ,
-this prefix causes a command to be run in 
+this prefix causes a command to be run in
 .IR acme 's own
 file name space and environment variable group.
 On Unix this is impossible.
t@@ -540,7 +545,7 @@ The environment variable
 .B $acmeshell
 determines which shell is used to execute such commands; the
 .IR rc (1)
-shell is used by default. 
+shell is used by default.
 .SS "Mouse button 3
 Pointing at text with button 3 instructs
 .I acme
t@@ -658,7 +663,7 @@ button and then typing Option without letting go of the button will
 cause a 1-2 chord, cutting the selection.
 On Mac systems, the usual keyboard shortcuts
 Command-C, -V, -X, and -Z invoke
-copy, paste, cut, and undo, 
+copy, paste, cut, and undo,
 and Command-Shift-Z invokes redo,
 as in other programs.
 Especially on Mac laptops, these keyboard shortcuts are