fli4l

These are collected changes for different minor problems:

- trivial typos in words

- removal of superfluous curly braces

- removal of trailing whitespace

- rewrap some paragraphs and insert some empty lines

- insert narrow whitespace in between abbreviations (typography)

- added comment with TODO for an example, which seems bad practice from

 crypto point of view

- use more \achtung and \texttt and \emph in some places

- maybe more, which I forgot now

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