org: Really fix example generation

* doc/org/autfilt.org, doc/org/dstar2tgba.org, doc/org/hoa.org,
doc/org/ltlcross.org: Fix several typos.  In particular ":results" and
":exports" both end with s.

doc/org/autfilt.org

@@ -27,7 +27,7 @@ same stream, =autfilt= will process them in batch.
 The output format can be controlled using [[file:oaut.org][the common output options]]
 (like =--spin=, =--lbtt=, =--dot=, =--hoaf=...).
 
-#+BEGIN_SRC sh :results silent :exports code
+#+BEGIN_SRC sh :results silent :exports both
 cat >example.hoa <<EOF
 HOA: v1
 States: 1
@@ -288,7 +288,7 @@ autfilt --help | sed -n '/Transformations:/,/^$/p' | sed '1d;$d'
 
 Here is an automaton with transition-based acceptance:
 
-#+BEGIN_SRC sh :result silent :export code
+#+BEGIN_SRC sh :results silent :exports both
 cat >aut-ex1.hoa<<EOF
 HOA: v1
 States: 3
@@ -313,14 +313,12 @@ State: 2
 EOF
 #+END_SRC
 
-#+RESULTS:
-
 (Note: the '=.=' argument passed to =--dot= below hides default
 options discussed [[file:oaut.org::#default-dot][on another page]], while the '=a=' causes the
 acceptance condition to be displayed.)
 
 #+NAME: autfilt-ex1
-#+BEGIN_SRC sh :results verbatim :export code
+#+BEGIN_SRC sh :results verbatim :exports code
 autfilt aut-ex1.hoa --dot=.a
 #+END_SRC
 
@@ -361,7 +359,7 @@ $txt
 Using =-S= will "push" the acceptance membership of the transitions to the states:
 
 #+NAME: autfilt-ex2
-#+BEGIN_SRC sh :results verbatim :export code
+#+BEGIN_SRC sh :results verbatim :exports code
 autfilt -S aut-ex1.hoa --dot=.a
 #+END_SRC
 
@@ -423,7 +421,7 @@ $txt
 Using =--cnf-acceptance= simply rewrites the acceptance condition in Conjunctive Normal Form:
 
 #+NAME: autfilt-ex3
-#+BEGIN_SRC sh :results verbatim :export code
+#+BEGIN_SRC sh :results verbatim :exports code
 autfilt --cnf-acceptance aut-ex1.hoa --dot=.a
 #+END_SRC
 
@@ -467,7 +465,7 @@ of Fin-acceptance: this usually requires adding non-deterministic jumps to
 altered copies of strongly-connected components.
 
 #+NAME: autfilt-ex4
-#+BEGIN_SRC sh :results verbatim :export code
+#+BEGIN_SRC sh :results verbatim :exports code
 autfilt --remove-fin aut-ex1.hoa --dot=.a
 #+END_SRC
 
@@ -513,7 +511,7 @@ transitions they contain.  The acceptance condition will be updated to
 reflect the fact that these sets can never be visited.
 
 #+NAME: autfilt-ex5
-#+BEGIN_SRC sh :results verbatim :export code
+#+BEGIN_SRC sh :results verbatim :exports code
 autfilt --mask-acc=1,2 aut-ex1.hoa --dot=.a
 #+END_SRC
 
@@ -559,7 +557,7 @@ Atomic propositions can be removed from an automaton in three ways:
 Here are the results of these three options on our example:
 
 #+NAME: autfilt-ex6a
-#+BEGIN_SRC sh :results verbatim :export code
+#+BEGIN_SRC sh :results verbatim :exports code
 autfilt --remove-ap=a aut-ex1.hoa --dot=.a
 #+END_SRC
 
@@ -598,7 +596,7 @@ $txt
 [[file:autfilt-ex6a.png]]
 
 #+NAME: autfilt-ex6b
-#+BEGIN_SRC sh :results verbatim :export code
+#+BEGIN_SRC sh :results verbatim :exports code
 autfilt --remove-ap=a=0 aut-ex1.hoa --dot=.a
 #+END_SRC
 
@@ -631,7 +629,7 @@ $txt
 [[file:autfilt-ex6b.png]]
 
 #+NAME: autfilt-ex6c
-#+BEGIN_SRC sh :results verbatim :export code
+#+BEGIN_SRC sh :results verbatim :exports code
 autfilt --remove-ap=a=1 aut-ex1.hoa --dot=.a
 #+END_SRC
 
@@ -662,3 +660,7 @@ $txt
 
 #+RESULTS:
 [[file:autfilt-ex6c.png]]
+
+#+BEGIN_SRC sh :results silent :exports results
+rm -f example.hoa aut-ex1.hoa
+#+END_SRC

doc/org/dstar2tgba.org

@@ -24,7 +24,7 @@ The following command instructs =ltl2dstar= to:
 Additionally we use =ltlfilt= to convert our formula to the
 prefix format used by =ltl2dstar=.
 
-#+BEGIN_SRC sh :results silent :exports code
+#+BEGIN_SRC sh :results silent :exports both
 ltlfilt -f 'Fa & GFb' -l | ltl2dstar --ltl2nba=spin:ltl2tgba@-sD - fagfb
 #+END_SRC
 

doc/org/hoa.org

@@ -159,7 +159,7 @@ State: 2
 
 will always be stored as a TωA with this transition structure:
 
-#+BEGIN_SRC sh :results verbatim :export results
+#+BEGIN_SRC sh :results verbatim :exports results
 autfilt -Ht stvstracc.hoa | sed -n '/--BODY/,/--END/p' | grep -v -- --
 #+END_SRC
 

doc/org/ltlcross.org

@@ -705,7 +705,7 @@ For instance the following will cross-compare =ltl2tgba= against
 runs out of memory (the hash tables used by =randltl= and =ltlcross=
 to remove duplicate formulas will keep growing).
 
-#+BEGIN_SRC sh :export code :eval no
+#+BEGIN_SRC sh :exports code :eval no
 randltl -n -1 --tree-size 10..25 a b c | ltlcross --stop-on-error 'ltl2tgba --lbtt %f >%O' 'ltl3ba -f %s >%O'
 #+END_SRC
 
@@ -722,14 +722,14 @@ generation of random formulas.  For instance the following command
 will run the translators on an infinite number of formulas, saving
 any problematic formula in =bugs.ltl=.
 
-#+BEGIN_SRC sh :export code :eval no
+#+BEGIN_SRC sh :exports code :eval no
 randltl -n -1 --tree-size 10..25 a b c | ltlcross --save-bogus=bugs.ltl 'ltl2tgba --lbtt %f >%O' 'ltl3ba -f %s >%O'
 #+END_SRC
 
 You can periodically check the contents of =bugs.ltl=, and then run
 =ltlcross= only on those formulas to look at the problems:
 
-#+BEGIN_SRC sh :export code :eval no
+#+BEGIN_SRC sh :exports code :eval no
 ltlcross -F bugs.ltl 'ltl2tgba --lbtt %f >%O' 'ltl3ba -f %s >%O'
 #+END_SRC