s/master/main/

Test: treehugger
Change-Id: I2c975b2f5f92f23c7357b6f7e785578504298cc6
diff --git a/libc/include/sys/cdefs.h b/libc/include/sys/cdefs.h
index 4154e62..a8fb624 100644
--- a/libc/include/sys/cdefs.h
+++ b/libc/include/sys/cdefs.h
@@ -38,7 +38,7 @@
 
 /**
  * `__BIONIC__` is always defined if you're building with bionic. See
- * https://android.googlesource.com/platform/bionic/+/master/docs/defines.md.
+ * https://android.googlesource.com/platform/bionic/+/main/docs/defines.md.
  */
 #define __BIONIC__ 1
 
@@ -187,7 +187,7 @@
 
 /*
  * _FILE_OFFSET_BITS 64 support.
- * See https://android.googlesource.com/platform/bionic/+/master/docs/32-bit-abi.md
+ * See https://android.googlesource.com/platform/bionic/+/main/docs/32-bit-abi.md
  */
 #if !defined(__LP64__) && defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS == 64
 #  define __USE_FILE_OFFSET64 1
diff --git a/libc/include/sys/mman.h b/libc/include/sys/mman.h
index f32ae61..823c9ba 100644
--- a/libc/include/sys/mman.h
+++ b/libc/include/sys/mman.h
@@ -58,7 +58,7 @@
 /**
  * mmap64() is a variant of mmap() that takes a 64-bit offset even on LP32.
  *
- * See https://android.googlesource.com/platform/bionic/+/master/docs/32-bit-abi.md
+ * See https://android.googlesource.com/platform/bionic/+/main/docs/32-bit-abi.md
  */
 void* _Nonnull mmap64(void* _Nullable __addr, size_t __size, int __prot, int __flags, int __fd, off64_t __offset);
 
diff --git a/libc/include/sys/sendfile.h b/libc/include/sys/sendfile.h
index a72091d..26522a6 100644
--- a/libc/include/sys/sendfile.h
+++ b/libc/include/sys/sendfile.h
@@ -38,7 +38,7 @@
 
 __BEGIN_DECLS
 
-/* See https://android.googlesource.com/platform/bionic/+/master/docs/32-bit-abi.md */
+/* See https://android.googlesource.com/platform/bionic/+/main/docs/32-bit-abi.md */
 #if defined(__USE_FILE_OFFSET64)
 ssize_t sendfile(int __out_fd, int __in_fd, off_t* _Nullable __offset, size_t __count) __RENAME(sendfile64);
 #else
diff --git a/libc/include/sys/types.h b/libc/include/sys/types.h
index f07c8fd..4622a4e 100644
--- a/libc/include/sys/types.h
+++ b/libc/include/sys/types.h
@@ -96,7 +96,7 @@
 typedef __time_t time_t;
 
 /* This historical accident means that we had a 32-bit off_t on 32-bit architectures. */
-/* See https://android.googlesource.com/platform/bionic/+/master/docs/32-bit-abi.md */
+/* See https://android.googlesource.com/platform/bionic/+/main/docs/32-bit-abi.md */
 #if defined(__USE_FILE_OFFSET64) || defined(__LP64__)
 typedef int64_t off_t;
 typedef off_t loff_t;