Merge pull request #553 from cplusplus/placeholder-space-fixes

Remove space after \placeholder so can embed in code.

Author: zygoloid

source/macros.tex

@@ -105,7 +105,7 @@
 \newcommand{\defn}[1]{\defnx{#1}{#1}}
 \newcommand{\term}[1]{\textit{#1}\xspace}
 \newcommand{\grammarterm}[1]{\textit{#1}\xspace}
-\newcommand{\placeholder}[1]{\textit{#1}\xspace}
+\newcommand{\placeholder}[1]{\textit{#1}}
 
 %%--------------------------------------------------
 %% allow line break if needed for justification