update docs for @ prefix in README.md
@@ -122,7 +122,7 @@ Run `xh help` for more detailed information.
- `:` for adding or removing headers e.g `connection:keep-alive` or `connection:`.
- `;` for including headers with empty values e.g `header-without-value;`.
-`@` postfix can be added to `=`,`:=`,`==` and `:` to read the value from a file e.g `x-api-key:@api-key.txt`.
+An `@` prefix can be used to read a value from a file. For example: `x-api-key:@api-key.txt`.
The request body can also be read from standard input, or from a file using `@filename`.
