Fix wording in decent-spaces.tex

Thanks to Pieter Belmans
http://stacks.math.columbia.edu/tag/03ID#comment-1361

decent-spaces.tex

@@ -1044,7 +1044,7 @@ \section{Reasonable and decent algebraic spaces}
 The algebraic space $\mathbf{A}^1_{\mathbf{Q}}/\mathbf{Z}$ constructed in
 Spaces, Example \ref{spaces-example-affine-line-translation}
 is not decent as its ``generic point'' cannot be represented by a monomorphism
-from the spectrum of a point.
+from the spectrum of a field.
 \end{example}
 
 \begin{remark}