Add several missing version annotations

I probably need to add this to the pre-release checklist. Don't think
there's a good way to automate this :(

doc/events/file_transfer.md

@@ -1,5 +1,6 @@
 ---
 module: [kind=event] file_transfer
+since: 1.101.0
 ---
 
 The @{file_transfer} event is queued when a user drags-and-drops a file on an open computer.

src/main/resources/data/computercraft/lua/rom/apis/textutils.lua

@@ -688,6 +688,7 @@ do
     @treturn[2] nil If the object could not be deserialised.
     @treturn string A message describing why the JSON string is invalid.
     @since 1.87.0
+    @changed 1.100.6 Added `parse_empty_array` option
     @see textutils.json_null Use to serialize a JSON `null` value.
     @see textutils.empty_json_array Use to serialize a JSON empty array.
     @usage Unserialise a basic JSON object

src/main/resources/data/computercraft/lua/rom/modules/main/cc/audio/dfpwm.lua

@@ -29,6 +29,7 @@ application or development builds of [FFmpeg].
 @see speaker.playAudio To play the decoded audio data.
 @usage Reads "data/example.dfpwm" in chunks, decodes them and then doubles the speed of the audio. The resulting audio
 is then re-encoded and saved to "speedy.dfpwm". This processed audio can then be played with the `speaker` program.
+@since 1.100.0
 
 ```lua
 local dfpwm = require("cc.audio.dfpwm")