Improve EVS event filter documentation

[skliper]

Is your feature request related to a problem? Please describe.
CFE_EVS_ResetFilter API documentation not clear, would help to add something like it will treat the next event with that EID like it was the first (independent of filter method) along with an example.

cFE/modules/core_api/fsw/inc/cfe_evs.h

Lines 290 to 292 in e80aae9

	** \par Description
	** The effect of resetting an event filter depends on the filter scheme.
	** The #CFE_EVS_EventFilter_BINARY scheme resets the filter counter for the specified Event ID.

Add description of how they actually work:

cFE/modules/core_api/fsw/inc/cfe_evs_api_typedefs.h

Lines 42 to 55 in e80aae9

	/** \name Common Event Filter Mask Values */
	/** \{ */
	#define CFE_EVS_NO_FILTER 0x0000 /**< \brief Stops any filtering. All messages are sent. */
	#define CFE_EVS_FIRST_ONE_STOP 0xFFFF /**< \brief Sends the first event. All remaining messages are filtered. */
	#define CFE_EVS_FIRST_TWO_STOP 0xFFFE /**< \brief Sends the first 2 events. All remaining messages are filtered. */
	#define CFE_EVS_FIRST_4_STOP 0xFFFC /**< \brief Sends the first 4 events. All remaining messages are filtered. */
	#define CFE_EVS_FIRST_8_STOP 0xFFF8 /**< \brief Sends the first 8 events. All remaining messages are filtered. */
	#define CFE_EVS_FIRST_16_STOP 0xFFF0 /**< \brief Sends the first 16 events. All remaining messages are filtered. */
	#define CFE_EVS_FIRST_32_STOP 0xFFE0 /**< \brief Sends the first 32 events. All remaining messages are filtered. */
	#define CFE_EVS_FIRST_64_STOP 0xFFC0 /**< \brief Sends the first 64 events. All remaining messages are filtered. */
	#define CFE_EVS_EVERY_OTHER_ONE 0x0001 /**< \brief Sends every other event. */
	#define CFE_EVS_EVERY_OTHER_TWO 0x0002 /**< \brief Sends two, filters one, sends two, filters one, etc */
	#define CFE_EVS_EVERY_FOURTH_ONE 0x0003 /**< \brief Sends every fourth event message. All others are filtered. */
	/** \} */

Describe the solution you'd like
Improve documentation

Describe alternatives you've considered
None

Additional context
Code review, note conversion to variables is in #1439

Requester Info
Jacob Hageman - NASA/GSFC