[valarray.access,c.math.lerp] Add spaces around operators (cplusplus#7886)

Author: Andreas-Krug

source/numerics.tex

@@ -7596,9 +7596,9 @@
 
 \pnum
 \remarks
-The expression \tcode{addressof(a[i+j]) == addressof(a[i]) + j}
+The expression \tcode{addressof(a[i + j]) == addressof(a[i]) + j}
 evaluates to \tcode{true} for all \tcode{size_t i} and \tcode{size_t j}
-such that \tcode{i+j < a.size()}.
+such that \tcode{i + j < a.size()}.
 
 \pnum
 The expression \tcode{addressof(a[i]) != addressof(b[j])}
@@ -9911,7 +9911,7 @@
 \item If \tcode{t == 1}, then \tcode{r == b}.
 \item If \tcode{t >= 0 \&\& t <= 1}, then \tcode{isfinite(r)}.
 \item If \tcode{isfinite(t) \&\& a == b}, then \tcode{r == a}.
-\item If \tcode{isfinite(t) || !isnan(t) \&\& b-a != 0}, then \tcode{!isnan(r)}.
+\item If \tcode{isfinite(t) || !isnan(t) \&\& b - a != 0}, then \tcode{!isnan(r)}.
 \end{itemize}
 Let \tcode{\placeholder{CMP}(x,y)} be \tcode{1} if \tcode{x > y},
 \tcode{-1} if \tcode{x < y}, and \tcode{0} otherwise.