[Keyboard] clarify readme for the growing number of kbd67 revisions (#5844)

* clarify readme for the growing number of kbd67 revisions

* some pr comment nits

keyboards/kbdfans/kbd67/hotswap/readme.md

@@ -1,4 +1,4 @@
-# hotswap
+# KBD67 hotswap
 
 A 65% hot swap board with blocker and USB Type C port. 
 
@@ -8,6 +8,6 @@ Hardware Availability: [KBDFans](https://kbdfans.cn/products/coming-soon-kbd67-m
 
 Make example for this keyboard (after setting up your build environment):
 
-    make kbd67/hotswap:default
+    make kbdfans/kbd67/hotswap:default
 
 See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).

keyboards/kbdfans/kbd67/readme.md

@@ -1,17 +1,22 @@
 # KBD67
 
-A 65% keyboard sold in two variants. Rev1 was a typical keyboard that had to be soldered together, supporting multiple layouts.
-Months later, a new version with hotswap was sold. **Firmware files from one, will not work on the other.** Please use the `.hex` appropriate for your board.
+A 65% keyboard sold in three variants. 
+1. Rev1: Typical keyboard that had to be soldered together, supporting multiple layouts.
+2. HotSwap: Released in late 2018, Hotswap single layout keyboard. 
+3. Rev2: Released in April/May 2019, the Rev2 also needs to be soldered together and supports multiple layouts. 
 
-The rev1 PCB for the KBD67 is sold under the name "KBD65."
+ **Firmware files are SPECIFIC to each board. Firmware files from one, will not work on the other.** Please use the `.hex` appropriate for your board.
+
+The rev1 PCB is sold under the name "KBD65".
 
 Keyboard Maintainer: [MechMerlin](https://github.com/mechmerlin)  
-Hardware Supported: KBD67  
+Hardware Supported: KBD67 rev1, rev2, hotswap  
 Hardware Availability: KBDFans  
 
-Make example for this keyboard (after setting up your build environment):
+Make examples for this keyboard (after setting up your build environment):
 
     make kbdfans/kbd67/rev1:default
+    make kbdfans/kbd67/rev2:default
     make kbdfans/kbd67/hotswap:default
 
 See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).

keyboards/kbdfans/kbd67/rev1/readme.md

@@ -1,4 +1,4 @@
-# kbd67
+# KBD67 rev1
 
 65% keyboard with blocker.  
 
@@ -8,6 +8,6 @@ Hardware Availability: KBDFans [Keyboard Kit](https://kbdfans.cn/products/coming
 
 Make example for this keyboard (after setting up your build environment):
 
-    make kbd67/rev1:default
+    make kbdfans/kbd67/rev1:default
 
 See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).