Fixed typo

src/document.rs

@@ -295,7 +295,7 @@ impl Document {
     /// Add a float value to the document.
     ///
     /// Args:
-    ///     field_name (str): The field name for which we are adding the integer.
+    ///     field_name (str): The field name for which we are adding the value.
     ///     value (f64): The float that will be added to the document.
     fn add_float(&mut self, field_name: String, value: f64) {
         add_value(self, field_name, value);