Merge pull request #712 from EgorovArtem34/typoInVariables

fix typo in word if

modules/30-variables/18-variable-concatenation/description.en.yml

@@ -33,7 +33,7 @@ theory: |
 
 instructions: |
 
-  Websites are constantly sending emails to their users. A common task is to automatically send a personalized email with the user's name in the header. IIf you store a person's name as a string somewhere in a website database, the task of generating the header boils down to concatenation. For instance, you have to concatenate the string `Hello` with a string containing their name.
+  Websites are constantly sending emails to their users. A common task is to automatically send a personalized email with the user's name in the header. If you store a person's name as a string somewhere in a website database, the task of generating the header boils down to concatenation. For instance, you have to concatenate the string `Hello` with a string containing their name.
 
   Write a program that will create a header and a body of the email using ready-made variables and print the resulting strings.