Typos

* NEWS, doc/org/concepts.org, doc/org/hierarchy.org,
  spot/misc/optionmap.hh, spot/twa/acc.hh, spot/twaalgos/ltl2tgba_fm.hh,
  spot/twaalgos/sccinfo.hh, spot/twaalgos/translate.cc: fix typos

NEWS

@@ -22,8 +22,8 @@ New in spot 2.3.5.dev (not yet released)
     LTL translators).
 
   - autfilt learned to build the union (--sum) or the intersection
-    (--sum-and) of two language by putting two automata side-by-side
-    and fiddling with the initial states.  This complement the already
+    (--sum-and) of two languages by putting two automata side-by-side
+    and fiddling with the initial states.  This complements the already
     implemented intersection (--product) and union (--product-or),
     both based on a product.
 
@@ -57,7 +57,7 @@ New in spot 2.3.5.dev (not yet released)
   - twa objects have a new property: prop_complete().  This obviously
     acts as a cache for the is_complete() function.
 
-  - spot::dualize() completements any alternating automaton.  Since
+  - spot::dualize() complements any alternating automaton.  Since
     the dual of a deterministic automaton is still deterministic, the
     function spot::dtwa_complement() has been deprecated and simply
     calls spot::dualize().
@@ -198,7 +198,7 @@ New in spot 2.3.5.dev (not yet released)
     been adjusted to these new semantics, see "Backward-incompatible
     changes" below.
 
-  - The parser for HOA now recognize and verifies correct use of the
+  - The parser for HOA now recognizes and verifies correct use of the
     "univ-branch" property.  This is known to be a problem with option
     -H1 of ltl3ba 1.1.2 and ltl3dra 0.2.4, so the environment variable
     SPOT_HOA_TOLERANT can be set to disable the diagnostic.
@@ -212,7 +212,7 @@ New in spot 2.3.5.dev (not yet released)
 
   - When the remove_fin() function was called on some automaton with
     Inf-less acceptance involving at least one disjunction (e.g.,
-    generalized co-Büchi), it would sometime output an automaton with
+    generalized co-Büchi), it would sometimes output an automaton with
     transition-based acceptance but marked as state-based.
 
   Backward-incompatible changes: