TST: Check Circle (#7596)

* TST: Trigger Circle [skip travis][skip azp]

* Fix stim channel case in tutorials

* TST: Fix hpi case in tutorials

tutorials/intro/plot_20_events_from_raw.py

@@ -72,7 +72,7 @@
 # What is a STIM channel?
 # ^^^^^^^^^^^^^^^^^^^^^^^
 #
-# A :term:`STIM channel` (short for "stimulus channel") is a channel that does
+# A :term:`stim channel` (short for "stimulus channel") is a channel that does
 # not receive signals from an EEG, MEG, or other sensor. Instead, STIM channels
 # record voltages (usually short, rectangular DC pulses of fixed magnitudes
 # sent from the experiment-controlling computer) that are time-locked to

tutorials/preprocessing/plot_60_maxwell_filtering_sss.py

@@ -201,7 +201,7 @@
 # ^^^^^^^^^^^^^^^^^^^^^
 #
 # If you have information about subject head position relative to the sensors
-# (i.e., continuous head position indicator coils, or :term:`cHPI <hpi>`), SSS
+# (i.e., continuous head position indicator coils, or :term:`cHPI <HPI>`), SSS
 # can take that into account when projecting sensor data onto the internal
 # subspace. Head position data can be computed using
 # :func:`mne.chpi.compute_chpi_locs` and :func:`mne.chpi.compute_head_pos`,

tutorials/raw/plot_20_event_arrays.py

@@ -33,7 +33,7 @@
 # :class:`~mne.io.Raw` object (see the section
 # :ref:`overview-tut-events-section` for details). Since the :ref:`sample
 # dataset <sample-dataset>` includes experimental events recorded on
-# :term:`STIM channel` ``STI 014``, we'll start this tutorial by parsing the
+# :term:`stim channel` ``STI 014``, we'll start this tutorial by parsing the
 # events from that channel using :func:`mne.find_events`:
 
 events = mne.find_events(raw, stim_channel='STI 014')