[PATCH] Tweak doc on command tfind

[Yao Qi]

Hi,
command "tfind" will find the first trace snapshot if no trace
snapshot is selected, but this behavior isn't documented.

This patch completes the doc of command "tfind" without argument.

gdb/doc:

2016-04-26  Yao Qi  <yao.qi@linaro.org>

	* gdb.texinfo (tfind): Complete doc about tfind without
	argument.
---
 gdb/doc/gdb.texinfo | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index 7abd55e..f74c41c 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -13385,7 +13385,8 @@ Stop debugging trace snapshots, resume @emph{live} debugging.
 Same as @samp{tfind none}.
 
 @item tfind
-No argument means find the next trace snapshot.
+No argument means find the next trace snapshot or find the first
+one if no trace snapshot is selected.
 
 @item tfind -
 Find the previous trace snapshot before the current one.  This permits
-- 
1.9.1