qcacld-3.0: cfg ini documentation refine

Some malformed comments were discovered when generating
the official documentation of wlan cfg ini items.

Refine the documentation text of the following items
in one batch:

gEnableDynamicDTIM
g_sap_chanswitch_mode
gVhtChannelWidth
gDataInactivityTimeout

Change-Id: I2b1455d0ea27fd35dc0cf66316c7dc3b348ee0ac
CRs-Fixed: 2416086

mlme/dispatcher/inc/cfg_mlme_vht_caps.h

@@ -217,9 +217,9 @@
  * gVhtChannelWidth - Channel width capability for 11ac
  * @Min: 0
  * @Max: 4
- * @Default: 3
+ * @Default: 2
  *
- * This ini is  used to set channel width capability for 11AC.
+ * This ini is used to set channel width capability for 11AC.
  * eHT_CHANNEL_WIDTH_20MHZ = 0,
  * eHT_CHANNEL_WIDTH_40MHZ = 1,
  * eHT_CHANNEL_WIDTH_80MHZ = 2,