Correct spelling error

Makefile

@@ -2,13 +2,13 @@
 # @date 2018-05-21                                                   #
 #                                                                    #
 # Feedback Arc Set: An algorithm which removes cycles in a directed  #
-# graph by removing the least edges possible.                        #
+# graph by removing the least amount of edges possible.              #
 #--------------------------------------------------------------------#
 
 CC = gcc
 CFLAGS = -std=c99 -pedantic -Wall -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_SVID_SOURCE -D_POSIX_C_SOURCE=200809L -g -c
 
-.PHONY: all clean
+.PHONY: all clean docs docs_clean
 
 all: supervisor generator
 
@@ -21,5 +21,11 @@ generator: generator.o
 %.o: %.c common.h
 	$(CC) $(CFLAGS) $^
 
+docs:
+	doxygen Doxyfile
+
 clean:
 	rm -f supervisor.o supervisor generator.o generator common.h.gch
+
+docs_clean:
+	rm -rf html