Fix missing punctuation

Thanks to Mattias
http://stacks.math.columbia.edu/tag/07P6#comment-2266

more-algebra.tex

@@ -9180,8 +9180,8 @@ \section{The singular locus}
 $X \setminus \text{Reg}(X)$, i.e., the set of primes $\mathfrak p$ such that
 $R_\mathfrak p$ is not a regular local ring. By the discussion preceding
 Algebra, Definition \ref{algebra-definition-regular}
-we see that $\text{Reg}(X)$ is stable under generalization
-In the section we study conditions that guarantee that $\text{Reg}(X)$
+we see that $\text{Reg}(X)$ is stable under generalization.
+In this section we study conditions that guarantee that $\text{Reg}(X)$
 is open.
 
 \begin{definition}