Update the function documentation in the header files

lv_misc/text.h

@@ -26,10 +26,40 @@
 /**********************
  * GLOBAL PROTOTYPES
  **********************/
+
+/**
+ * Get size of a text
+ * @param size_res pointer to a 'point_t' variable to store the result
+ * @param text pointer to a text
+ * @param font pinter to font of the text
+ * @param letter_space letter space of the text
+ * @param line_space line space of the text
+ * @param max_width max with of the text (break the lines to fit this size) Set LV_CORD_MAX to avoid line breaks
+ */
 void txt_get_size(point_t * size_res, const char * text, const font_t * font,
-		          uint16_t letter_space, uint16_t line_space, cord_t max_width);
-uint16_t txt_get_next_line(const char * txt, const font_t * font_p, uint16_t letter_space, cord_t max_l);
-cord_t txt_get_width(const char * txt, uint16_t char_num, const font_t * font_p, uint16_t letter_space);
+                    uint16_t letter_space, uint16_t line_space, cord_t max_width);
+
+/**
+ * Get the next line of text. Check line length and break chars too.
+ * @param txt a '\0' terminated string
+ * @param font_p pointer to a font
+ * @param letter_space letter space
+ * @param max_l max line length
+ * @return the index of the first char of the new line
+ */
+uint16_t txt_get_next_line(const char * txt, const font_t * font_p,
+                            uint16_t letter_space, cord_t max_l);
+
+/**
+ * Give the length of a text with a given font
+ * @param txt a '\0' terminate string
+ * @param char_num number of characters in 'txt'
+ * @param font_p pointer to a font
+ * @param letter_space letter sapce
+ * @return length of a char_num long text
+ */
+cord_t txt_get_width(const char * txt, uint16_t char_num,
+                    const font_t * font_p, uint16_t letter_space);
 
 /**********************
  *      MACROS