Improve documentation of 'backtrace-on-error-noninteractive'

* src/eval.c (syms_of_eval) <backtrace-on-error-noninteractive>:
Format the doc string according to conventions.

* etc/NEWS: Improve formatting and wording of the entry describing
'backtrace-on-error-noninteractive.

1 files changed, 4 insertions, 2 deletions

diff --git a/src/eval.c b/src/eval.c
index 1351d283c58..e2d70aaa0ef 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -4267,8 +4267,10 @@ still determine whether to handle the particular condition.  */);
 
   DEFVAR_BOOL ("backtrace-on-error-noninteractive",
                backtrace_on_error_noninteractive,
-               doc: /* If non-nil and Emacs is running noninteractively,
-print a backtrace on encountering an unhandled error.  */);
+               doc: /* Non-nil means print backtrace on error in batch mode.
+If this is nil, errors in batch mode will just print the error
+message upon encountering an unhandled error, without showing
+the Lisp backtrace.  */);
   backtrace_on_error_noninteractive = true;
 
   /* The value of num_nonmacro_input_events as of the last time we