RFR (XXXS) 8174857: jshell tool: /help /set truncation -- confusing indentation

[Robert Field]

There is tab ("\t") in the documentation for "/set truncation" that 
messes up the indentation, making the text harder to understand.
Fix is to remove the tab.
Please review..

Bug:

     https://bugs.openjdk.java.net/browse/JDK-8174857

Diff --

diff -r 39f31cef8e6a 
src/jdk.jshell/share/classes/jdk/internal/jshell/tool/resources/l10n.properties
--- 
a/src/jdk.jshell/share/classes/jdk/internal/jshell/tool/resources/l10n.properties 
Mon Feb 13 08:50:26 2017 -0800
+++ 
b/src/jdk.jshell/share/classes/jdk/internal/jshell/tool/resources/l10n.properties 
Mon Feb 13 11:34:54 2017 -0800
@@ -650,7 +650,7 @@
     varinit    -- variable declaration with init\n\t\
     expression -- expression -- note: {name}==scratch-variable-name\n\t\
     varvalue   -- variable value expression\n\t\
-   assignment -- assign variable\n\t\
+   assignment -- assign variable\n\
  The action selector kind describes what happened to the snippet. The 
values are:\n\t\
     added     -- snippet has been added\n\t\
     modified  -- an existing snippet has been modified\n\t\