Fix proof of a lemma

Thanks to Minseon Shin

algebra.tex

@@ -7581,7 +7581,7 @@ \section{Normal rings}
 because all the identities in $R$
 among the elements $a_i, b_i, f_{ji}$ also hold in $R_0$.
 By Lemma \ref{lemma-almost-integral} the element
-$f$ is almost integral over $R_0[x]$. By the first part of
+$f$ is almost integral over $R_0[x]$. By the second statement of
 the lemma, the elements $\alpha_i$ are almost integral
 over $R_0$. And since $R_0$ is Noetherian, they are
 integral over $R_0$, see Lemma \ref{lemma-almost-integral}.