enable termwiz and termion features on generating API doc

.github/workflows/ci.yml

@@ -41,4 +41,4 @@ jobs:
       - run: cargo clippy --examples --no-default-features --features tuirs-termion,search -- -D warnings
       - run: cargo clippy --examples --no-default-features --features tuirs-no-backend -- -D warnings
       - run: cargo clippy --examples --no-default-features --features tuirs-no-backend,search -- -D warnings
-      - run: cargo rustdoc --features=search -p tui-textarea -- -D warnings
+      - run: cargo rustdoc --features=search,termwiz,termion -p tui-textarea -- -D warnings

Cargo.toml

@@ -110,5 +110,6 @@ members = [
 lto = "thin"
 
 [package.metadata.docs.rs]
-features = ["search"]
+targets = ["x86_64-unknown-linux-gnu"]
+features = ["search", "crossterm", "termwiz", "termion"]
 rustdoc-args = ["--cfg", "docsrs"]