tweaks: normalize whitespace, drop unneeded prototype, condense comment

src/prototypes.h

@@ -412,7 +412,6 @@ void block_sigwinch(bool blockit);
 #ifndef NANO_TINY
 void handle_sigwinch(int signal);
 void regenerate_screen(void);
-void do_toggle(int flag);
 #endif
 void disable_kb_interrupt(void);
 void enable_kb_interrupt(void);

src/text.c

@@ -1465,8 +1465,7 @@ bool begpar(const linestruct *const line, int depth)
 {
 	size_t quot_len, indent_len, prev_dent_len;
 
-	/* If this is the very first line of the buffer, it counts as a BOP
-	 * even when it contains no text. */
+	/* The very first line counts as a BOP, even when it contains no text. */
 	if (line->prev == NULL)
 		return TRUE;