Fix typo in algebra

Thanks to John Smith
http://stacks.math.columbia.edu/tag/02ML#comment-2451

CONTRIBUTORS

@@ -208,6 +208,7 @@ Arpith Shanbhag
 Liran Shaul
 Minseon Shin
 Jeroen Sijsling
+John Smith
 Thomas Smith
 Tanya Kaushal Srivastava
 Axel St\"abler

algebra.tex

@@ -29021,7 +29021,7 @@ \section{Quasi-finite maps}
 in $S_{\mathfrak p}/\mathfrak pS_{\mathfrak p}$. By what we said
 above there exist $e_i \geq 1$ such that $P(x_i)^{e_i} = 0$
 in $S_{\mathfrak p}$. Let $g_1 \in R$, $g_1 \not \in \mathfrak p$
-be an element such that $P_i \in R[1/g_1]$ for all $i$.
+be an element such that $P_i$ has coefficients in $R[1/g_1]$ for all $i$.
 Next, let $g_2 \in R$, $g_2 \not \in \mathfrak p$ be an element
 such that $P(x_i)^{e_i} = 0$ in $S_{g_1g_2}$. Setting $g = g_1g_2$
 we win.