fix spelling mistakes

chapters/angel-av-video.tex

@@ -10,6 +10,6 @@
 			\item You decide, which sources to show
 		\end{itemize}
 		\item Mixed video feed is used for both, live-stream and the recordings 
-		\item You might get assistance by a director on callenging talks
+		\item You might get assistance by a director on challenging talks
 	\end{itemize}
 \end{frame}

chapters/audio-headset.tex

@@ -3,8 +3,8 @@
 \begin{frame}{Microphones}
 	\begin{itemize}
 		\item We prefer headset microphones over handheld for speakers
-		\item Distance to mouth will be constant -> more conststent audio level
-		\item Handheld microphones for hearalds and Q\&A
+		\item Distance to mouth will be constant -> more consistent audio level
+		\item Handheld microphones for heralds and Q\&A
 		\item Our transmitters also have a mute button (yellow light = muted)
 		\item Please check battery level from time to time
 	\end{itemize}

chapters/audio-touchmix.tex

@@ -12,7 +12,7 @@
 		\begin{itemize}
 			\item Mute unused microphones (bottom row)
 			\item Adjust hall loudness with rightmost fader
-			\item Adjust individual microphone level with fader or redude "trim" knob when it's clipping
+			\item Adjust individual microphone level with fader or reduce "trim" knob when it's clipping
 			\item Please keep microphones un-muted during applause
 		\end{itemize}
 	\end{columns}
@@ -28,8 +28,8 @@
 		\end{figure}
 		\column{0.4\textwidth}
 		\begin{itemize}
-			\item If mute buttos are yellow, go back to "Main Mix" page
-			\item If anything else is shown, just pres "Home" button
+			\item If mute buttons are yellow, go back to "Main Mix" page
+			\item If anything else is shown, just press "Home" button
 		\end{itemize}
 	\end{columns}
 \end{frame}

chapters/camera-tripod.tex

@@ -51,6 +51,6 @@
 		\end{itemize}
 		\metroset{block=fill}
 		\begin{alertblock}{Alert}
-			Alert the A/V-Technichian if something's wrong or not running.
+			Alert the A/V-Technician if something's wrong or not running.
 		\end{alertblock}
 \end{frame}