qcacld-3.0: Add missing CFG INI comment text - wave 1

Some CFG INI options' comment text are missing.

Add them so automation script can parse and retrieve the
correct comment text.

Change-Id: I4f79b075244c18490c52bc9a178d36c47db43878
CRs-Fixed: 2348307

mlme/dispatcher/inc/cfg_mlme_ht_caps.h

@@ -342,7 +342,7 @@
  * @Max: 7
  * @Default: 7
  *
- * This ini is used to set default MDPU Density
+ * This ini is used to set default MPDU Density
  *
  * Related: None
  *