add some index entries

spells.tex

@@ -17,7 +17,7 @@ Death spells will encourage the little seed of death which sits within us all, a
 
 The primordial breath to speak the language of spells comes from the wind, bringing inspiration to those who can listen.
 Of course, spellcasters without the patience for inspiration often resort to just gutting a giant arachnid for its webbing, mixing in some griffin-feathers, and twisting the world by force.
-A good witch leaves no part of her prey unused. 
+A good witch leaves no part of her prey unused.
 
 \columnbreak
 \input{config/rules/spells.tex}

systems.tex

@@ -281,6 +281,7 @@ Nobody survives long underground unless they can tell if the ceiling might colla
 \makeAutoRule{march}{Marching}{gain 1~\glsfmtplural{fatigue} each mile of rough terrain, and 1~\glsfmtplural{fatigue} for every 2~miles of road, each \glsfmttext{interval}}
 \index{Walking}
 \index{Marching}
+\index{Travel}
 Marching characters gain 1~\glspl{fatigue} each mile of rough terrain, and 1~\glsfmtplural{fatigue} for every 2~miles of road, each \gls{interval}.
 If \pgls{pc} has 5 \glspl{hp}, they can march for 3 miles in the morning, then rest and recuperate 3 \glspl{fatigue} over midday, then do the same over evening and night.
 
@@ -293,6 +294,7 @@ Travelling by road means the troupe can usually sleep in \pgls{village} or at le
 \makeRule{navigate_land}{Navigating on land}{Intelligence}{Wyldcrafting}{by terrain type, Failure Margin adds 2 miles}
 \index{Navigation}
 \index{Marching}
+\index{Travel!Navigation}
 
 \begin{itemize}
   \item

traits.tex

@@ -12,6 +12,7 @@ All of the derived Traits come from these three.%
 
 \section{Attributes}
 \label{randomAttributes}
+\index{Attributes}
 
 \begin{multicols}{2}