docs(watch): document --include flag

Co-authored-by: Kingston Tam <web@ktam.org>

docs/watch-mode.md

@@ -21,20 +21,30 @@ By default, _tsx_ watches all imported files, except those in the following dire
 - `dist`
 - Hidden directories (`.*`)
 
-## Ignoring files
+## Customizing watched files
 
-To exclude specific files or directories from being watched, use the `--ignore` flag:
+### Including files to watch
+
+To include specific files or directories to watch, use the `--include` flag:
+
+```sh
+tsx watch --include ./other-dep.txt --include "./other-deps/*" ./file.ts
+```
+
+
+### Excluding files from watch
+To exclude specific files from being watched, use the `--exclude` flag:
 
 ```sh
-tsx watch --ignore ./ignore-me.js --ignore ./ignore-me-too.js ./file.ts
+tsx watch --exclude ./ignore-me.js --exclude ./ignore-me-too.js ./file.ts
 ```
 
 ### Using glob patterns
 
 Glob patterns allow you to define a set of files or directories to ignore. To prevent your shell from expanding the glob patterns, wrap them in quotes:
 
 ```sh
-tsx watch --ignore "./data/**/*" ./file.ts
+tsx watch --exclude "./data/**/*" ./file.ts
 ```
 
 ## Tips