[libc] Generate docs for setjmp.h

Resolves #88065

Author: Rajveer100

libc/docs/c23.rst

@@ -18,6 +18,9 @@ Implementation Status
 
 Additions:
 
+* setjmp.h
+
+  * longjmp |check|
 * fenv.h
 
   * fesetexcept |check|

libc/docs/setjmp.rst

@@ -0,0 +1,16 @@
+.. include:: check.rst
+
+setjmp.h Functions
+==================
+
+.. list-table::
+  :widths: auto
+  :align: center
+  :header-rows: 1
+
+  * - Function
+    - Implemented
+    - Standard
+  * - longjmp
+    - |check|
+    - 7.13.2.1

libc/utils/docgen/setjmp.json

@@ -0,0 +1,15 @@
+{
+  "macros": {
+    "__STDC_VERSION_SETJMP_H__": {
+      "defined": "7.13.2"
+    },
+    "setjmp": {
+      "defined": "7.13.1.1"
+    }
+  },
+  "functions": {
+    "longjmp": {
+      "defined": "7.13.2.1"
+    }
+  }
+}