Explanation of semicolon (Issue #266) (#338)

* Update 01-sql-basic-queries.md (Issue #266)

#266 
Improved the basic introduction to SQL code at the beginning of the "## Writing my first query" section.
-Explained semicolon in a callout box.
-Moved explanation regarding line breaks from bottom of page to the callout box earlier in the page.

* Revise note about semicolons.

* Typo

---------

Co-authored-by: James Foster <[email protected]>

Author: ShenmengXu

_episodes/01-sql-basic-queries.md

@@ -250,8 +250,10 @@ The computer is basically doing this:
 3. Displaying requested columns or expressions.
 
 Clauses are written in a fixed order: `SELECT`, `FROM`, `WHERE`, then `ORDER
-BY`. It is possible to write a query as a single line, but for readability,
-we recommend to put each clause on its own line.
+BY`. 
+
+> It is possible to write a query as a single line, but for readability, we recommend to put each clause on its own line.
+> The standard way to separate each SQL statement is with a semicolon. This allows more than one SQL statement to be executed together.
 
 > ## Challenge
 >