Add basic documentation for text commands.

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diff --git a/docs/text_commands.md b/docs/text_commands.md
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+# Text Commands
+
+## `$00`: `text` *text*
+
+Start writing text until `"@"`.
+
+## `$4E`: `next` *text*
+
+Move a line down.
+
+## `$4F`: `line` *text*
+
+Start writing at the bottom line.
+
+## `$50`: `page` *text*
+
+Start a new Pokédex page.
+
+## `$51`: `para` *text*
+
+Start a new paragraph.
+
+## `$55`: `cont` *text*
+
+Scroll to the next line.
+
+## `$57`: `done`
+
+End a text box.
+
+## `$58`: `prompt`
+
+Prompt the player to end a text box (initiating some other event).
+
+## `$01`: `text_from_ram` *address*
+
+Write text from a RAM address.
+
+## `$02`: `text_bcd` *address*, *flags*
+
+Write [BCD](https://en.wikipedia.org/wiki/Binary-coded_decimal) from an address,
+typically RAM.
+
+## `$03`: `text_move` *address*
+
+Move to a new tile.
+
+## `$04`: `text_box` *address*, *height*, *width*
+
+Draw a box.
+
+## `$05`: `text_low`
+
+Write text at (1, 16).
+
+## `$06`: `text_waitbutton`
+
+Wait for button press; show arrow.
+
+## `$07`: `text_scroll`
+
+Pushes text up two lines and sets the `bc` cursor to the border tile below the
+first character column of the text box.
+
+## `$08`: `start_asm`
+
+Start interpreting assembly code.
+
+## `$09`: `deciram` *address*, *bytes*, *digits*
+
+Read *bytes* bytes from *address* and print them as a *digits*-digit number.
+
+## `$0A`: `interpret_data`
+
+Exit.
+
+## `$0B`: `sound_dex_fanfare_50_79`
+
+Play `SFX_DEX_FANFARE_50_79`.
+
+## `$0C`: `limited_interpret_data` *number*
+
+Print *number* `"…"`s.
+
+## `$0D`: `link_wait_button`
+
+Wait for button press; show arrow.
+
+## `$0E`: `sound_dex_fanfare_20_49`
+
+Play `SFX_DEX_FANFARE_20_49`.
+
+## `$0F`: `sound_item`
+
+Play `SFX_ITEM`.
+
+## `$10`: `sound_caught_mon`
+
+Play `SFX_CAUGHT_MON`.
+
+## `$11`: `sound_dex_fanfare_80_109`
+
+Play `SFX_DEX_FANFARE_80_109`.
+
+## `$12`: `sound_fanfare`
+
+Play `SFX_FANFARE`.
+
+## `$13`: `sound_slot_machine_start`
+
+Play `SFX_SLOT_MACHINE_START`.
+
+## `$14`: `text_buffer` *id*
+
+Write text from one of the following addresses (listed in `StringBufferPointers`):
+
+0. `StringBuffer3`
+1. `StringBuffer4`
+2. `StringBuffer5`
+3. `StringBuffer2`
+4. `StringBuffer1`
+5. `EnemyMonNick`
+6. `BattleMonNick`
+
+## `$15`: `current_day`
+
+Print the weekday.
+
+## `$16`: `text_jump` *address*
+
+Write text from a different bank.