docs: update activity codes decription

README.md

@@ -34,24 +34,24 @@ Every record is formatted as:
 
 - **subject_id** – integer 1600–1650 uniquely identifying the volunteer
 - **activity_code** – single ASCII letter A–S (the letter N is deliberately skipped) denoting the performed activity:
-  -  "A" - walkling
-  -  "B" - jogging
-  -  "C" - stairs
-  -  "D" - sitting
-  -  "E" - standing
-  -  "F" - typing
-  -  "G" - tooth-brushing
-  -  "H" - soup (eating)
-  -  "I" - chips (eating)
-  -  "J" - pasta (eating)
-  -  "K" - driking
-  -  "L" - sandwich (eating)
-  -  "M" - kicking
-  -  "O" - catch
-  -  "P" - dribbling
-  -  "Q" - writing
-  -  "R" - clapping
-  -  "S" - folding
+  -  "A" - Walking
+  -  "B" - Jogging
+  -  "C" - Stairs
+  -  "D" - Sitting
+  -  "E" - Standing
+  -  "F" - Typing
+  -  "G" - Brushing Teet
+  -  "H" - Eating Soup
+  -  "I" - Eating Chips
+  -  "J" - Eating Pasta
+  -  "K" - Driking from Cup
+  -  "L" - Eating Sandwich
+  -  "M" - Kicking (Soccer Ball)
+  -  "O" - Playing Catch w/ Tennis Ball
+  -  "P" - Dribbling (Basketball)
+  -  "Q" - Writing
+  -  "R" - Clapping
+  -  "S" - Folding Clothes
 - **timestamp** – Unix epoch in seconds
 - **x, y, z** – instantaneous sensor readings for the corresponding device and modality