[libc][NFC] Make all top of file comments consistent.

Summary:
Made all header files consistent based of this documentation: https://llvm.org/docs/CodingStandards.html#file-headers.
And did the same for all source files top of file comments.

Reviewers: sivachandra, abrachet

Reviewed By: sivachandra, abrachet

Subscribers: MaskRay, tschuett, libc-commits

Tags: #libc-project

Differential Revision: https://reviews.llvm.org/D77533

Author: PaulkaToast

libc/config/linux/errno.h.in

@@ -1,4 +1,4 @@
-//===---------------- Linux specific errno.h definitions ------------------===//
+//===-- Linux specific errno.h definitions --------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.

libc/config/linux/signal.h.in

@@ -1,4 +1,4 @@
-//===---------------- Linux specific signal.h definitions -----------------===//
+//===-- Linux specific signal.h definitions -------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.

libc/config/linux/threads.h.in

@@ -1,4 +1,4 @@
-//===--------- Linux specific definitions of types from threads.h ---------===//
+//===-- Linux specific definitions of types from threads.h ----------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.

libc/fuzzing/string/strcpy_fuzz.cpp

@@ -1,4 +1,4 @@
-//===--------------------- strcpy_fuzz.cpp --------------------------------===//
+//===-- strcpy_fuzz.cpp ---------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.

libc/include/__llvm-libc-common.h

@@ -1,4 +1,4 @@
-//===------- Common definitions for LLVM-libc public header files- --------===//
+//===-- Common definitions for LLVM-libc public header files --------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.

libc/include/__posix-types.h

@@ -1,4 +1,4 @@
-//===----------------- Definitions of common POSIX types ------------------===//
+//===-- Definitions of common POSIX types ---------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.

libc/include/assert.h.def

@@ -1,4 +1,4 @@
-//===---------------- C standard library header assert.h ------------------===//
+//===-- C standard library header assert.h --------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.

libc/include/ctype.h

@@ -1,4 +1,4 @@
-//===---------------- C standard library header ctype.h -----------------*-===//
+//===-- C standard library header ctype.h ---------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.

libc/include/errno.h.def

@@ -1,4 +1,4 @@
-//===---------------- C standard library header errno.h ------------------===//
+//===-- C standard library header errno.h ---------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.

libc/include/math.h.def

@@ -1,4 +1,4 @@
-//===----------------- C standard library header math.h -----------------*-===//
+//===-- C standard library header math.h ----------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.