[container.alloc.reqmts,sequence.reqmts] Add period at end (#7614)

Author: Andreas-Krug

source/containers.tex

@@ -1129,7 +1129,7 @@
 
 \pnum
 \ensures
-\tcode{u == t}, \tcode{u.get_allocator() == m}
+\tcode{u == t}, \tcode{u.get_allocator() == m}.
 
 \pnum
 \complexity
@@ -2199,7 +2199,7 @@
 \begin{itemdescr}
 \pnum
 \result
-\tcode{reference; const_reference} for constant \tcode{a}
+\tcode{reference; const_reference} for constant \tcode{a}.
 
 \pnum
 \effects
@@ -2222,7 +2222,7 @@
 \begin{itemdescr}
 \pnum
 \result
-\tcode{reference; const_reference} for constant \tcode{a}
+\tcode{reference; const_reference} for constant \tcode{a}.
 
 \pnum
 \returns