docs in patch tutorial

docs/tutorial/patch.qmd

@@ -180,7 +180,7 @@ Specific data formats may also add attributes (e.g. "gauge_length", "pulse_width
 
 ## String representation
 
-DASCore Patches have as useful string representation:
+DASCore Patches have a useful string representation:
 
 ```{python}
 import dascore as dc
@@ -189,6 +189,19 @@ patch = dc.get_example_patch()
 print(patch)
 ```
 
+## Shortcuts
+
+DASCore Patches offer useful shortcuts for quickly accessing information:
+
+```{python}
+import dascore as dc
+
+patch = dc.get_example_patch()
+print(patch.seconds) # to get the number of seconds in the patch.
+print(patch.channel_count) # to get the number of channels in the patch.
+```
+
+
 # Selecting (trimming)
 
 Patches are trimmed using the [`select`](`dascore.Patch.select`) method. Most commonly, `select` takes the coordinate name and a tuple of (lower_limit, upper_limit) as the values. Either limit can be `...` indicating an open interval.