[allocator.requirements] Separate floats better

Author: tkoeppe

source/lib-intro.tex

@@ -1815,6 +1815,8 @@
 \tcode{args}    &   a function parameter pack with the pattern \tcode{Args\&\&} \\
 \end{libreqtab2}
 
+\newpage
+
 \begin{libreqtab4d}
 {Allocator requirements}
 {tab:utilities.allocator.requirements}