invoke.texi (use-after-scope-direct-emission-threshold): Fix typos and grammar,…

invoke.texi (use-after-scope-direct-emission-threshold): Fix typos and grammar, use active voice, and clarify.

	* doc/invoke.texi (use-after-scope-direct-emission-threshold):
	Fix typos and grammar, use active voice, and clarify.

Co-Authored-By: Martin Liska <mliska@suse.cz>

From-SVN: r245606

gcc/ChangeLog

+2017-02-18  Gerald Pfeifer  <gerald@pfeifer.com>
+	    Martin Liška  <mliska@suse.cz>
+
+	* doc/invoke.texi (use-after-scope-direct-emission-threshold):
+	Fix typos and grammar, use active voice, and clarify.
+
 2017-02-20  Marek Polacek  <polacek@redhat.com>
 
 	PR middle-end/79537

gcc/doc/invoke.texi

@@ -10492,9 +10492,9 @@ E.g. to disable inline code use
 @option{--param asan-instrumentation-with-call-threshold=0}.
 
 @item use-after-scope-direct-emission-threshold
-If size of a local variable in bytes is smaller or equal to this number,
-direct instruction emission is utilized to poison and unpoison local variables.
-Default value in 256.
+If the size of a local variable in bytes is smaller or equal to this
+number, directly poison (or unpoison) shadow memory instead of using
+run-time callbacks.  The default value is 256.
 
 @item chkp-max-ctor-size
 Static constructors generated by Pointer Bounds Checker may become very