Change phrasing

src/fundamentals/main.tex

@@ -64,8 +64,7 @@
 \Ac{qec} is a field of research combining quantum mechanics and
 ``classical'' communications engineering.
 This chapter provides the relevant theoretical background on both of
-these topics and subsequently, building on top of this, introduces the
-the fundamentals of \ac{qec}.
+these topics and subsequently introduces the the fundamentals of \ac{qec}.
 
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 % TODO: Is Quantum Information Theory the correct title here? Would someth