feat: fix ramdisk file copies being incorrectly marked as directories, update man pages

programs/man/spawn.2

@@ -19,12 +19,12 @@
 
         int pid = montauk::spawn("0:/os/man.elf", "intro");
 
-    The new process gets its own PML4 page table, a 16 KiB stack
-    (at 0x7FFFFEF000-0x7FFFFFF000), and begins executing at the
+    The new process gets its own PML4 page table, a 32 KiB stack
+    (at 0x7FFFFF7000-0x7FFFFFF000), and begins executing at the
     ELF entry point (_start).
 
     Returns the new process's PID on success, or -1 on failure.
-    Failure occurs when there are no free process slots (max 16),
+    Failure occurs when there are no free process slots (max 256),
     the file cannot be found, or the ELF is invalid.
 
 .SS waitpid