Fix typo: "key word" -> "keyword"

src/content/chapter3_data_types/lesson04_record_pattern_matching/en.html

@@ -1,12 +1,12 @@
 <p>
-  It is possible to pattern match on a record, this allows for the extraction 
+  It is possible to pattern match on a record, this allows for the extraction
   of multiple field values from a record into distinct variables, similar to matching on a tuple or a list.
 </p>
 <p>
-  The let key word can only match on single variant custom types. For types with more variants 
+  The <code>let</code> keyword can only match on single variant custom types. For types with more variants
   a case expression must be used.
 </p>
 <p>
-  It is possible to use underscore <code>_</code> or the spread syntax <code>..</code> to 
+  It is possible to use underscore <code>_</code> or the spread syntax <code>..</code> to
   discard fields that are not required.
-</p>
+</p>