comment: fix grammar and acronym casing in message.zig doc comments

- "the number of messages we send to the IO thread are also very few"
  had a subject-verb agreement issue; reworded to "is also very small"
- Capitalized "pty" -> "PTY"

src/termio/message.zig

@@ -8,21 +8,21 @@ const MessageData = @import("../datastruct/main.zig").MessageData;
 /// The messages that can be sent to an IO thread.
 ///
 /// This is not a tiny structure (~40 bytes at the time of writing this comment),
-/// but the messages are IO thread sends are also very few. At the current size
-/// we can queue 26,000 messages before consuming a MB of RAM.
+/// but the number of messages we send to the IO thread is also very small.
+/// At the current size we can queue 26,000 messages before consuming a MB of RAM.
 pub const Message = union(enum) {
     /// Represents a write request. Magic number comes from the largest
     /// other union value. It can be upped if we add a larger union member
     /// in the future.
     pub const WriteReq = MessageData(u8, 38);
 
-    /// Request a color scheme report is sent to the pty.
+    /// Request a color scheme report is sent to the PTY.
     color_scheme_report: struct {
         /// Force write the current color scheme
         force: bool,
     },
 
-    /// Request a visibility report is sent to the pty.
+    /// Request a visibility report is sent to the PTY.
     visibility_report: struct {
         /// The visibility state to report.
         visible: bool,
@@ -48,7 +48,7 @@ pub const Message = union(enum) {
     /// Resize the window.
     resize: renderer.Size,
 
-    /// Request a size report is sent to the pty ([in-band
+    /// Request a size report is sent to the PTY ([in-band
     /// size report, mode 2048](https://gist.github.com/rockorager/e695fb2924d36b2bcf1fff4a3704bd83) and
     /// [XTWINOPS](https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h4-Functions-using-CSI-_-ordered-by-the-final-character-lparen-s-rparen:CSI-Ps;Ps;Ps-t.1EB0)).
     size_report: SizeReport,