Fix typo in `crates/egui_glow/README.md` (#2956)

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Closes <https://github.com/emilk/egui/issues/THE_RELEVANT_ISSUE>.

crates/egui_glow/README.md

@@ -19,7 +19,7 @@ sudo apt-get install libxcb-render0-dev libxcb-shape0-dev libxcb-xfixes0-dev lib
 
 This crate optionally depends on [`egui-winit`](https://github.com/emilk/egui/tree/master/crates/egui-winit).
 
-Text the example with:
+Test the example with:
 
 ``` sh
 cargo run -p egui_glow --example pure_glow --features=winit,egui/default_fonts