c++: Further -fcontract* option description fixes

During testing I've missed my previous patch just changed:
-FAIL: compiler driver --help=c++ option(s): "^ +-.*[^:.]\$" absent from output: "  -fcontract-build-level=[off|default|audit] Specify max contract level to generate runtime checks for"
+FAIL: compiler driver --help=c++ option(s): "^ +-.*[^:.]\$" absent from output: "  -fcontract-role=<name>:<semantics> Specify the semantics for all levels in a role (default, review), or a custom contract role with given semantics (ex: opt:assume,assume,assume)"
rather than actually fixed it, the test only reports the first such problem.

This patch fixes the remaining ones.

2022-11-24  Jakub Jelinek  <jakub@redhat.com>

	* c.opt (fcontract-role=, fcontract-semantic=): Terminate descriptions
	with a dot.
diff --git a/gcc/c-family/c.opt b/gcc/c-family/c.opt
index 4b05391..0d0ad0a 100644
--- a/gcc/c-family/c.opt
+++ b/gcc/c-family/c.opt
@@ -1713,11 +1713,11 @@
 
 fcontract-role=
 C++ Joined RejectNegative
--fcontract-role=<name>:<semantics>	Specify the semantics for all levels in a role (default, review), or a custom contract role with given semantics (ex: opt:assume,assume,assume)
+-fcontract-role=<name>:<semantics>	Specify the semantics for all levels in a role (default, review), or a custom contract role with given semantics (ex: opt:assume,assume,assume).
 
 fcontract-semantic=
 C++ Joined RejectNegative
--fcontract-semantic=<level>:<semantic>	Specify the concrete semantics for level
+-fcontract-semantic=<level>:<semantic>	Specify the concrete semantics for level.
 
 fcoroutines
 C++ LTO Var(flag_coroutines)