Spelling fixes.

Makefile

@@ -69,7 +69,7 @@ check: advent cheat
 	cd tests; $(MAKE) --quiet
 
 # Requires gcov, lcov, libasan6, and libubsan1
-# The last two are Ubuntu names, might vary onb other distributions.
+# The last two are Ubuntu names, might vary on other distributions.
 # After this, run your browser on coverage/open-adventure/index.html
 # to see coverage results. Browse coverage/adventure.yaml.html
 # to see symbol coverage over the YAML file.
@@ -134,7 +134,7 @@ linty: CCFLAGS += -Winit-self
 linty: CCFLAGS += -Wpointer-arith
 linty: advent cheat
 
-# These seem to be more modeern options for enabling coverage testing.
+# These seem to be more modern options for enabling coverage testing.
 # Documenting them here in case a future version bump disables --coverage.
 #debug: CCFLAGS += -ftest-coverage
 #debug: CCFLAGS += -fprofile-arcs

advent.h

@@ -65,7 +65,7 @@
  * PROP_STASHED is supposed to map a state property value to a
  * negative range, where the object cannot be picked up but the value
  * can be recovered later.  Various objects get this property when
- * the cave starts to close. On;y seems to be signifucant for the bird 
+ * the cave starts to close. Only seems to be significant for the bird
  * and readable objects, notably the clam/oyster - but the code around
  * those test is difficult to read.
  */
@@ -243,7 +243,7 @@ struct game_t {
     } dwarves[NDWARVES + 1];
     struct {
 #ifdef FOUNDBOOL
-	bool32_t found;	         // has the location of this object bween found?
+	bool32_t found;	         // has the location of this object been found?
 #endif
 	loc_t fixed;             // fixed location of object (if not IS_FREE)
         int32_t prop;            // object state */

main.c

@@ -860,7 +860,7 @@ static bool closecheck(void)
          *  snake is known to have been destroyed and needn't be
          *  carried away from its old "place"), making the various
          *  objects be handled differently.  We also drop all other 
-         *  objects he might be acrrying (lest he have some which
+         *  objects he might be carrying (lest he has some which
          *  could cause trouble, such as the keys).  We describe the
          *  flash of light and trundle back. */
         put(BOTTLE, LOC_NE, EMPTY_BOTTLE);