Addressing PR mandatory checks.

Trailing whitespace issue, and attempting to resolve element ordering issues
by putting each preconditions etc. element introducer onto their own line.

Author: AlisdairM

source/future.tex

@@ -1819,7 +1819,8 @@
 
 \begin{itemdescr}
 \pnum
-\expects \tcode{p} is not null.
+\expects
+\tcode{p} is not null.
 
 \pnum
 \returns
@@ -1837,7 +1838,8 @@
 
 \begin{itemdescr}
 \pnum
-\expects \tcode{p} is not null.
+\expects
+\tcode{p} is not null.
 
 \pnum
 \returns
@@ -1855,7 +1857,8 @@
 
 \begin{itemdescr}
 \pnum
-\expects \tcode{p} is not null.
+\expects
+\tcode{p} is not null.
 \tcode{mo} is neither \tcode{memory_order::release} nor \tcode{memory_order::acq_rel}.
 
 \pnum
@@ -1874,7 +1877,8 @@
 
 \begin{itemdescr}
 \pnum
-\expects \tcode{p} is not null.
+\expects
+\tcode{p} is not null.
 
 \pnum
 \effects
@@ -1892,7 +1896,8 @@
 
 \begin{itemdescr}
 \pnum
-\expects \tcode{p} is not null.
+\expects
+\tcode{p} is not null.
 \tcode{mo} is neither \tcode{memory_order::acquire} nor \tcode{memory_order::acq_rel}.
 
 \pnum
@@ -1911,7 +1916,8 @@
 
 \begin{itemdescr}
 \pnum
-\expects \tcode{p} is not null.
+\expects
+\tcode{p} is not null.
 
 \pnum
 \returns
@@ -1930,7 +1936,8 @@
 
 \begin{itemdescr}
 \pnum
-\expects \tcode{p} is not null.
+\expects
+\tcode{p} is not null.
 
 \pnum
 \effects
@@ -1953,7 +1960,8 @@
 
 \begin{itemdescr}
 \pnum
-\expects \tcode{p} is not null and \tcode{v} is not null.
+\expects
+\tcode{p} is not null and \tcode{v} is not null.
 
 \pnum
 \returns
@@ -1996,7 +2004,8 @@
 
 \begin{itemdescr}
 \pnum
-\expects \tcode{p} is not null and \tcode{v} is not null.
+\expects
+\tcode{p} is not null and \tcode{v} is not null.
 The \tcode{failure} argument is neither \tcode{memory_order::release} nor
 \tcode{memory_order::acq_rel}.
 
@@ -2601,11 +2610,13 @@
 
 \begin{itemdescr}
 \pnum
-\mandates The value type of \tcode{Source} and \tcode{InputIterator} is
+\mandates
+The value type of \tcode{Source} and \tcode{InputIterator} is
 \tcode{char} or \keyword{char8_t}.
 
 \pnum
-\expects The \tcode{source} and \range{first}{last} sequences are UTF-8 encoded. 
+\expects
+The \tcode{source} and \range{first}{last} sequences are UTF-8 encoded.
 \tcode{Source} meets the requirements specified in \ref{fs.path.req}.
 
 \pnum