The Source code formatting section states:

Use semantic line breaks in LaTeX source code: http://sembr.org/

sembr.org states (rule 4):

A semantic line break MUST occur after a sentence, as punctuated by a period (.), exclamation mark (!), or question mark (?).

But the LaTeX example on the wiki page shows:

Lorem ipsum first sentence here, defining a
\defn{thing}\indextext{alternate entry}. When
needed,\footnote{mind the spacing} add