Improve comments.

main.c

@@ -255,7 +255,7 @@ static void checkhints(void)
                     game.hintlc[hint] = 0;
                     return;
                 default: // LCOV_EXCL_LINE
-                    // Should never hap[pen
+                    // Should never happen
                     BUG(HINT_NUMBER_EXCEEDS_GOTO_LIST); // LCOV_EXCL_LINE
                 }
 

misc.c

@@ -35,6 +35,7 @@ static void* xcalloc(size_t size)
 /*  I/O routines (speak, pspeak, rspeak, sspeak, get_input, yes) */
 
 static void vspeak(const char* msg, bool blank, va_list ap)
+/* Engine for various speak functions */
 {
     // Do nothing if we got a null pointer.
     if (msg == NULL)
@@ -122,6 +123,7 @@ static void vspeak(const char* msg, bool blank, va_list ap)
 }
 
 void speak(const char* msg, ...)
+/* speak a specified string */
 {
     va_list ap;
     va_start(ap, msg);
@@ -130,6 +132,7 @@ void speak(const char* msg, ...)
 }
 
 void sspeak(const int msg, ...)
+/* Speak a message from the arbitrary-messages list */
 {
     va_list ap;
     va_start(ap, msg);

templates/dungeon.h.tpl

@@ -12,7 +12,7 @@
 #define COND_FLUID	2	/* Liquid asset, see bit 1 */
 #define COND_NOARRR	3	/* Pirate doesn't go here unless following */
 #define COND_NOBACK	4	/* Cannot use "back" to move away */
-#define COND_ABOVE	5
+#define COND_ABOVE	5	/* Aboveground, but not in forest */
 #define COND_DEEP	6	/* Deep - e.g where dwarves are active */
 #define COND_FOREST	7	/* In the forest */
 #define COND_FORCED	8	/* Only one way in or out of here */