/usr/share/doc/lynx-common/docs/slang.key is in lynx-common 2.8.9dev8-4ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | S-Lang Keymaps for DOS
F0 0x200
F(X) (SL_KEY_F0 + X) /* If X>1 */
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