[docs][libc] Add AIO documentation refering POSIX and include in build (#122219)

With reference to #122006 , add a new header reference (aio.yaml) to doc

Author: StarOne01

libc/docs/CMakeLists.txt

@@ -32,6 +32,7 @@ if (SPHINX_FOUND)
     # math.h), those should be omitted and exist statically in
     # libc/docs/headers/.
     list(APPEND docgen_list
+      aio
       arpa/inet
       assert
       ctype

libc/docs/headers/index.rst

@@ -4,6 +4,7 @@ Implementation Status
 .. toctree::
    :maxdepth: 1
 
+   aio
    arpa/inet
    assert
    complex

libc/utils/docgen/aio.yaml

@@ -0,0 +1,35 @@
+macros:
+  AIO_ALLDONE:
+    in-latest-posix: ''
+  AIO_CANCELED:
+    in-latest-posix: ''
+  AIO_NOTCANCELED:
+    in-latest-posix: ''
+  LIO_NOP:
+    in-latest-posix: ''
+  LIO_NOWAIT:
+    in-latest-posix: ''
+  LIO_READ:
+    in-latest-posix: ''
+  LIO_WAIT:
+    in-latest-posix: ''
+  LIO_WRITE:
+    in-latest-posix: ''
+    
+functions:
+  aio_cancel:
+    in-latest-posix: ''
+  aio_error:
+    in-latest-posix: ''
+  aio_fsync:
+    in-latest-posix: ''
+  aio_read:
+    in-latest-posix: ''
+  aio_return:
+    in-latest-posix: ''
+  aio_suspend:
+    in-latest-posix: ''
+  aio_write:
+    in-latest-posix: ''
+  lio_listio:
+    in-latest-posix: ''