[DMDB] Fix errors

semester4/dmdb/parts/01_sql/00_intro.tex

@@ -1,13 +1,13 @@
 \acrshort{sql}, or unabbreviated, \acrlong{sql}, is a \gls{declarative} programming language, used to describe and operate on databases.
 
-This is is the point to mention \hlhref{https://xkcd.com/927/}{xkcd standards comic}, because, as is the case with almost any standard,
+This is is the point to mention the \hlhref{https://xkcd.com/927/}{xkcd standards comic}, because, as is the case with almost any standard,
 people deviate from it and new standards form.
 
 Even though \textit{most} \acrshort{sql} databases support the standard SQL operations, many have added a lot of features on top.
 
 \sql\ is split up into the following parts:
 \begin{itemize}
-\item Data Definition Language, used to create, modify and delete schemas.
-\item Data Manipulation Language, used to insert, update and delete data
-\item Query Language, used to retrieve data
+    \item Data Definition Language, used to create, modify and delete schemas.
+    \item Data Manipulation Language, used to insert, update and delete data
+    \item Query Language, used to retrieve data
 \end{itemize}