Corrected mistaken "The" instead of "There" (#1617)

src/error/option_unwrap/defaults.md

@@ -1,6 +1,6 @@
 # Unpacking options and defaults
 
-The is more than one way to unpack an `Option` and fall back on a default if it is `None`. To choose the one that meets our needs, we need to consider the following:
+There is more than one way to unpack an `Option` and fall back on a default if it is `None`. To choose the one that meets our needs, we need to consider the following:
 * do we need eager or lazy evaluation?
 * do we need to keep the original empty value intact, or modify it in place?