Update C17 option descriptions not to say "expected to be published".

	* c.opt (std=c17, std=c18, std=gnu17, std=gnu18, std=iso9899:2017)
	(std=iso9899:2018): Document C17 as published in 2018.

From-SVN: r265250

gcc/c-family/ChangeLog

+2018-10-17  Joseph Myers  <joseph@codesourcery.com>
+
+	* c.opt (std=c17, std=c18, std=gnu17, std=gnu18, std=iso9899:2017)
+	(std=iso9899:2018): Document C17 as published in 2018.
+
 2018-10-12  Christophe Lyon  <christophe.lyon@linaro.org>
 
 	PR c++/87364

gcc/c-family/c.opt

@@ -1992,11 +1992,11 @@ Deprecated in favor of -std=c11.
 
 std=c17
 C ObjC
-Conform to the ISO 2017 C standard (expected to be published in 2018).
+Conform to the ISO 2017 C standard (published in 2018).
 
 std=c18
 C ObjC Alias(std=c17)
-Conform to the ISO 2017 C standard (expected to be published in 2018).
+Conform to the ISO 2017 C standard (published in 2018).
 
 std=c89
 C ObjC Alias(std=c90)
@@ -2062,11 +2062,11 @@ Deprecated in favor of -std=gnu11.
 
 std=gnu17
 C ObjC
-Conform to the ISO 2017 C standard (expected to be published in 2018) with GNU extensions.
+Conform to the ISO 2017 C standard (published in 2018) with GNU extensions.
 
 std=gnu18
 C ObjC Alias(std=gnu17)
-Conform to the ISO 2017 C standard (expected to be published in 2018) with GNU extensions.
+Conform to the ISO 2017 C standard (published in 2018) with GNU extensions.
 
 std=gnu89
 C ObjC Alias(std=gnu90)
@@ -2106,11 +2106,11 @@ Conform to the ISO 2011 C standard.
 
 std=iso9899:2017
 C ObjC Alias(std=c17)
-Conform to the ISO 2017 C standard (expected to be published in 2018).
+Conform to the ISO 2017 C standard (published in 2018).
 
 std=iso9899:2018
 C ObjC Alias(std=c17)
-Conform to the ISO 2017 C standard (expected to be published in 2018).
+Conform to the ISO 2017 C standard (published in 2018).
 
 traditional
 Driver