[hackers] [libzahl] Fix typo || Mattias Andrée

[git]

commit a72b716d241c2ef797482a5e4ebd6731a010fd03
Author:     Mattias Andrée <maand...@kth.se>
AuthorDate: Fri May 13 20:49:21 2016 +0200
Commit:     Mattias Andrée <maand...@kth.se>
CommitDate: Fri May 13 20:49:21 2016 +0200

    Fix typo
    
    Signed-off-by: Mattias Andrée <maand...@kth.se>

diff --git a/doc/number-theory.tex b/doc/number-theory.tex
index a49bc42..eb57ef5 100644
--- a/doc/number-theory.tex
+++ b/doc/number-theory.tex
@@ -179,7 +179,7 @@ $\max x : 2^x \vert z$ is returned by {\tt zlsb(z)}
 \section{Primality test}
 \label{sec:Primality test}
 
-The primality of an integer can be test with
+A primality of an integer can be test with
 
 \begin{alltt}
    enum zprimality zptest(z_t w, z_t a, int t);