Some corrections.

manual/opencs/filters.tex

@@ -1,4 +1,4 @@
-\section{Filters}
+\section{Record filters}
 \subsection{Introduction}
 Filters are the key element of OpenCS use cases by allowing rapid and easy access to the searched records presented in all tables. Therefore: in order to use this application fully effective you should make sure that all concepts and instructions written in the this section of the manual are perfectly clear to you.\\
 Don't be afraid though, filters are fairly intuitive and easy to use.
@@ -10,7 +10,7 @@ Don't be afraid though, filters are fairly intuitive and easy to use.
  \item[Criteria] describes condition under with any any record is being select by the filter.
  \item[Syntax] as you may noticed computers (in general) are rather strict, and expect only strictly formulated orders -- that is: written with correct syntax.
  \item[Expression] is way we are actually performing filtering. Filter can be treated as ``functions'': accepts arguments, and evaluates either to the true or false for every column record at the time.
- \item[N-ary] is any expression that expects two or more expressions as arguments. It is useful for grouping two (or more) other expressions together in order to create filter that will check for criteria placed in two (again: or more) columns (logical ``or'', ``and'').
+ \item[N-ary] is any expression that expects one or more expressions as arguments. It is useful for grouping two (or more) other expressions together in order to create filter that will check for criteria placed in two (again: or more) columns (logical ``or'', ``and'').
  \item[unary] is any expression that expects one other expression. The example is ``not'' expression. In fact ``not'' is the only useful unary expression in OpenCS record filters.
  \item[nullary] is expression that does not accepts other expressions. It accepts arguments specified later.
 \end{description}