feat/update description of exercise form inputs

frontend/www/exercise.html

@@ -31,17 +31,17 @@
             </div>
             <div class="col-lg-6"></div>
             <div class="col-lg-6">
-                <label for="inputUnit" class="form-label">Unit</label>
+                <label for="inputUnit" class="form-label">Unit (Reps, time, etc.)</label>
                 <input type="text" class="form-control" id="inputUnit" name="unit" readonly>
             </div>
             <div class="col-lg-6"></div>
             <div class="col-lg-6">
-                <label for="inputDuration" class="form-label"> Duration (Seconds per unit)</label>
+                <label for="inputDuration" class="form-label"> Duration(Expects a positive integer)</label>
                 <input type="number" class="form-control" id="inputDuration" name="duration" readonly></input>
             </div>
             <div class="col-lg-6"></div>
             <div class="col-lg-6">
-                <label for="inputCalories" class="form-label"> Calories burned (kcal per minute)</label>
+                <label for="inputCalories" class="form-label"> Calories burned (Expects a positive integer)</label>
                 <input type="number" class="form-control" id="inputCalories" name="calories" readonly></input>
             </div>
             <div class="col-lg-6"></div>