Add missing devdoc pages to make.jl (#29948)

(cherry picked from commit cd6c415)

Author: mortenpi

doc/make.jl

@@ -132,6 +132,8 @@ const PAGES = [
             "devdocs/offset-arrays.md",
             "devdocs/require.md",
             "devdocs/inference.md",
+            "devdocs/ssair.md",
+            "devdocs/gc-sa.md",
         ],
         "Developing/debugging Julia's C code" => [
             "devdocs/backtraces.md",