Document the lack of evaluation of inline code blocks in keyword lines

* doc/org.texi (Evaluating code blocks): Add footnote explaining that
inline code blocks are not evaluated inside keyword lines.

doc/org.texi

@@ -14984,13 +14984,16 @@ evaluation from the @kbd{C-c C-c} key binding.}.  This will call the
 its results into the Org mode buffer.
 
 @cindex #+CALL
-It is also possible to evaluate named code blocks from anywhere in an Org
-mode buffer or an Org mode table.  These named code blocks can be located in
-the current Org mode buffer or in the ``Library of Babel'' (@pxref{Library of
-Babel}).  Named code blocks can be evaluated with a separate @code{#+CALL:}
-line or inline within a block of text.  In both cases the result is wrapped
-according to the value of @code{org-babel-inline-result-wrap}, which by
-default is @code{"=%s="} for markup that produces verbatim text.
+It is also possible to evaluate named code blocks from
+anywhere@footnote{Actually, the constructs call_<name>() and src_<lang>@{@}
+are not evaluated when they appear in a keyword line (i.e. lines starting
+with @code{#+KEYWORD:}, @pxref{In-buffer settings}).}  in an Org mode buffer
+or an Org mode table.  These named code blocks can be located in the current
+Org mode buffer or in the ``Library of Babel'' (@pxref{Library of Babel}).
+Named code blocks can be evaluated with a separate @code{#+CALL:} line or
+inline within a block of text.  In both cases the result is wrapped according
+to the value of @code{org-babel-inline-result-wrap}, which by default is
+@code{"=%s="} for markup that produces verbatim text.
 
 The syntax of the @code{#+CALL:} line is