[libc][math] fix header generation (#149918)

Author: bassiounix

libc/include/math.yaml

@@ -33,14 +33,14 @@ functions:
     return_type: float
     arguments:
       - type: float
-    name: acoshf16
+  - name: acoshf16
     standards:
       - stdc
     return_type: _Float16
     arguments:
       - type: _Float16
     guard: LIBC_TYPES_HAS_FLOAT16
-    name: acospif16
+  - name: acospif16
     standards:
       - stdc
     return_type: _Float16