Use .md extension for markdown files

Linking to line numbers is brittle, linking to sections/headings is better.

If you still want to link to a line number, you can append ?plain=1 to GitHub's URL

doc/client_lua_api.md

@@ -947,7 +947,7 @@ Setting-related
 ---------------
 
 * `minetest.settings`: Settings object containing all of the settings from the
-  main config file (`minetest.conf`). Check lua_api.txt for class reference.
+  main config file (`minetest.conf`). Check lua_api.md for class reference.
 * `minetest.setting_get_pos(name)`: Loads a setting from the main settings and
   parses it as a position (in the format `(1,2,3)`). Returns a position or nil.
 

doc/menu_lua_api.md

@@ -5,7 +5,7 @@ Introduction
 -------------
 
 The main menu is defined as a formspec by Lua in `builtin/mainmenu/`
-Description of formspec language to show your menu is in `lua_api.txt`
+Description of formspec language to show your menu is in `lua_api.md`
 
 
 Callbacks
@@ -77,7 +77,7 @@ Filesystem
   * `destination` folder to extract to
   * returns true/false
 * `core.sound_play(spec, looped)` -> handle
-  * `spec` = `SimpleSoundSpec` (see `lua_api.txt`)
+  * `spec` = `SimpleSoundSpec` (see `lua_api.md`)
   * `looped` = bool
 * `core.sound_stop(handle)`
 * `core.get_video_drivers()`
@@ -338,7 +338,7 @@ Settings
 * `core.settings:save()` -> nil, save all settings to config file
 
 For a complete list of methods of the `Settings` object see
-[lua_api.txt](https://github.com/minetest/minetest/blob/master/doc/lua_api.txt)
+[lua_api.md](https://github.com/minetest/minetest/blob/master/doc/lua_api.md)
 
 
 Worlds
@@ -371,7 +371,7 @@ Helpers
 * `fgettext(string, ...)` -> string
   * same as `fgettext_ne()`, but calls `core.formspec_escape` before returning result
 * `core.parse_json(string[, nullvalue])` -> something (possible in async calls)
-  * see `core.parse_json` (`lua_api.txt`)
+  * see `core.parse_json` (`lua_api.md`)
 * `dump(obj, dumped={})`
   * Return object serialized as a string
 * `string:split(separator)`

doc/mkdocs/build.sh

@@ -4,8 +4,8 @@
 MARKDOWN_FILE=$(pip show markdown | awk '/Location/ { print $2 }')/markdown/extensions/codehilite.py
 patch -N -r - $MARKDOWN_FILE lua_highlight.patch || true
 
-# Split lua_api.txt on top level headings
-cat ../lua_api.txt | csplit -sz -f docs/section - '/^=/-1' '{*}'
+# Split lua_api.md on top level headings
+cat ../lua_api.md | csplit -sz -f docs/section - '/^=/-1' '{*}'
 
 cat > mkdocs.yml << EOF
 site_name: Minetest API Documentation

doc/texture_packs.md

@@ -51,7 +51,7 @@ unsure, just test your texture pack in-game.
 Texture modifiers
 -----------------
 
-See lua_api.txt for texture modifiers
+See lua_api.md for texture modifiers
 
 Special textures
 ----------------
@@ -209,7 +209,7 @@ Here are targets you can choose from:
 Nodes support all targets, but other items only support 'inventory'
 and 'wield'.
 
-¹ : `N` is an integer [0,255]. Sets align_style = "world" and scale = N on the tile, refer to lua_api.txt for details.
+¹ : `N` is an integer [0,255]. Sets align_style = "world" and scale = N on the tile, refer to lua_api.md for details.
 
 ### Using the special targets