document to_float and full_screen

Author: togglebyte

src/backend.md

@@ -27,3 +27,17 @@ Hides the cursor.
 
 Clears the screen. Useful when not enabling an alt screen (which will be cleared
 by default).
+
+## `full_screen` function
+
+As a convenience it's possible to call `TuiBackend::full_screen()`.
+This is the same as writing:
+```rust
+let mut backend = Self::builder()
+    .enable_alt_screen()
+    .enable_raw_mode()
+    .hide_cursor()
+    .finish()
+    .unwrap();
+backend.finalize();
+```

src/templates/functions.md

@@ -70,6 +70,20 @@ text greetings[to_int(true)]
 
 Will output: "Hi".
 
+## `to_float(arg)`
+
+Try to convert any value to a floating point number.
+
+Boolean `true` will convert to `1.0`, and `false` will convert to `0.0`.
+
+### Example
+
+```
+text to_float(123)
+```
+
+Will output: "123".
+
 ## `round(number, decimal_count=0)`
 
 Round a floating point value.