[meta.reflection.traits] Use maths variables consistently

Also removes a comma that should not have been added.

Author: tkoeppe

source/meta.tex

@@ -6829,8 +6829,8 @@
 \begin{itemdescr}
 \pnum
 \returns
-\tcode{rank_v<T>},
-where \tcode{T} is the type represented by \tcode{dealias(type)}.
+\tcode{rank_v<$T$>},
+where $T$ is the type represented by \tcode{dealias(type)}.
 \end{itemdescr}
 
 \indexlibraryglobal{extent}%
@@ -6841,9 +6841,9 @@
 \begin{itemdescr}
 \pnum
 \returns
-\tcode{extent_v<T, I>},
-where \tcode{T} is the type represented by \tcode{dealias(type)}
-and \tcode{I} is a constant equal to \tcode{i}.
+\tcode{extent_v<$T$, $I$>},
+where $T$ is the type represented by \tcode{dealias(type)}
+and $I$ is a constant equal to \tcode{i}.
 \end{itemdescr}
 
 \indexlibraryglobal{tuple_size}%
@@ -6854,8 +6854,8 @@
 \begin{itemdescr}
 \pnum
 \returns
-\tcode{tuple_size_v<T>},
-where \tcode{T} is the type represented by \tcode{dealias(type)}.
+\tcode{tuple_size_v<$T$>},
+where $T$ is the type represented by \tcode{dealias(type)}.
 \end{itemdescr}
 
 \indexlibraryglobal{tuple_element}%
@@ -6867,8 +6867,8 @@
 \pnum
 \returns
 A reflection representing
-the type denoted by \tcode{tuple_element_t<$I$, T>},
-where \tcode{T} is the type represented by \tcode{dealias(type)},
+the type denoted by \tcode{tuple_element_t<$I$, $T$>},
+where $T$ is the type represented by \tcode{dealias(type)}
 and $I$ is a constant equal to \tcode{index}.
 \end{itemdescr}
 
@@ -6880,8 +6880,8 @@
 \begin{itemdescr}
 \pnum
 \returns
-\tcode{variant_size_v<T>},
-where \tcode{T} is the type represented by \tcode{dealias(type)}.
+\tcode{variant_size_v<$T$>},
+where $T$ is the type represented by \tcode{dealias(type)}.
 \end{itemdescr}
 
 \indexlibraryglobal{variant_alternative}%
@@ -6893,8 +6893,8 @@
 \pnum
 \returns
 A reflection representing the type denoted by
-\tcode{variant_alternative_t<\brk{}$I$, T>},
-where \tcode{T} is the type represented by \tcode{dealias(type)}
+\tcode{variant_alternative_t<$I$, $T$>},
+where $T$ is the type represented by \tcode{dealias(type)}
 and $I$ is a constant equal to \tcode{index}.
 \end{itemdescr}
 
@@ -6906,8 +6906,8 @@
 \begin{itemdescr}
 \pnum
 \returns
-\tcode{type_order_v<T1, T2>},
-where \tcode{T1} and \tcode{T2} are the types
+\tcode{type_order_v<$T_1$, $T_2$>},
+where $T_1$ and $T_2$ are the types
 represented by \tcode{dealias(t1)} and \tcode{dealias(t2)}, respectively.
 \end{itemdescr}