[dcl.init, class.directory_iterator, fs.op.current_path] Split multiparagraph notes into multiple note paragraphs.

The paragraphs are unrelated and don't belong into a single note.

Author: Eelis

source/declarators.tex

@@ -2466,8 +2466,10 @@
 \pnum
 \begin{note}
 Default arguments are more restricted; see~\ref{dcl.fct.default}.
+\end{note}
 
 \pnum
+\begin{note}
 The order of initialization of variables with static storage duration is described in~\ref{basic.start}
 and~\ref{stmt.dcl}.
 \end{note}

source/iostreams.tex

@@ -12775,8 +12775,10 @@
 a symbolic link to a non-existent file. Programs recursively
 walking directory trees for purposes of removing and renaming entries may wish
 to avoid following symbolic links.
+\end{note}
 
 \pnum
+\begin{note}
 If a file  is removed from or added to a directory after the
 construction of a \tcode{directory_iterator} for the directory, it is
 unspecified whether or not subsequently incrementing the iterator will ever
@@ -13768,10 +13770,10 @@
 
 \pnum
 \begin{note} The \tcode{current_path()} name was chosen to emphasize that the returned value is a
-  path, not just a single directory name.
+  path, not just a single directory name. \end{note}
 
 \pnum
-The current path as returned by many operating systems is a dangerous
+\begin{note} The current path as returned by many operating systems is a dangerous
   global variable. It may be changed unexpectedly by a third-party or system
   library functions, or by another thread. \end{note}
 \end{itemdescr}