flash_map: Increase minimum supported write align via flash_area_align

Signed-off-by: Gustavo Henrique Nihei <gustavo.nihei@espressif.com>
diff --git a/docs/PORTING.md b/docs/PORTING.md
index d69a965..4804096 100644
--- a/docs/PORTING.md
+++ b/docs/PORTING.md
@@ -141,31 +141,31 @@
 
 ```c
 /*< Opens the area for use. id is one of the `fa_id`s */
-int     flash_area_open(uint8_t id, const struct flash_area **);
-void    flash_area_close(const struct flash_area *);
+int      flash_area_open(uint8_t id, const struct flash_area **);
+void     flash_area_close(const struct flash_area *);
 /*< Reads `len` bytes of flash memory at `off` to the buffer at `dst` */
-int     flash_area_read(const struct flash_area *, uint32_t off, void *dst,
-                     uint32_t len);
+int      flash_area_read(const struct flash_area *, uint32_t off, void *dst,
+                         uint32_t len);
 /*< Writes `len` bytes of flash memory at `off` from the buffer at `src` */
-int     flash_area_write(const struct flash_area *, uint32_t off,
-                     const void *src, uint32_t len);
+int      flash_area_write(const struct flash_area *, uint32_t off,
+                          const void *src, uint32_t len);
 /*< Erases `len` bytes of flash memory at `off` */
-int     flash_area_erase(const struct flash_area *, uint32_t off, uint32_t len);
+int      flash_area_erase(const struct flash_area *, uint32_t off, uint32_t len);
 /*< Returns this `flash_area`s alignment */
-uint8_t flash_area_align(const struct flash_area *);
+uint32_t flash_area_align(const struct flash_area *);
 /*< What is value is read from erased flash bytes. */
-uint8_t flash_area_erased_val(const struct flash_area *);
+uint8_t  flash_area_erased_val(const struct flash_area *);
 /*< Given flash area ID, return info about sectors within the area. */
-int     flash_area_get_sectors(int fa_id, uint32_t *count,
-                     struct flash_sector *sectors);
+int      flash_area_get_sectors(int fa_id, uint32_t *count,
+                                struct flash_sector *sectors);
 /*< Returns the `fa_id` for slot, where slot is 0 (primary) or 1 (secondary).
     `image_index` (0 or 1) is the index of the image. Image index is
     relevant only when multi-image support support is enabled */
-int     flash_area_id_from_multi_image_slot(int image_index, int slot);
+int      flash_area_id_from_multi_image_slot(int image_index, int slot);
 /*< Returns the slot (0 for primary or 1 for secondary), for the supplied
     `image_index` and `area_id`. `area_id` is unique and is represented by
     `fa_id` in the `flash_area` struct. */
-int     flash_area_id_to_multi_image_slot(int image_index, int area_id);
+int      flash_area_id_to_multi_image_slot(int image_index, int area_id);
 ```
 
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