Add several spelling corrections

- from https://github.com/mne-tools/mne-python/pull/9706
diff --git a/codespell_lib/data/dictionary.txt b/codespell_lib/data/dictionary.txt
index 15c0087..8d2703f 100644
--- a/codespell_lib/data/dictionary.txt
+++ b/codespell_lib/data/dictionary.txt
@@ -631,6 +631,7 @@
 acquiantences->acquaintances
 acquiesence->acquiescence
 acquited->acquitted
+acquition->acquisition
 acqure->acquire
 acqured->acquired
 acqures->acquires
@@ -4940,6 +4941,7 @@
 ccordinats->coordinates
 ccoutant->accountant
 ccpcheck->cppcheck
+ccurred->occurred
 ccustom->custom
 ccustoms->customs
 cdecompress->decompress
@@ -5170,6 +5172,7 @@
 charactersistic->characteristic
 charactersistically->characteristically
 charactersistics->characteristics
+charactersitic->characteristic
 charactersm->characters
 characterss->characters
 characterstic->characteristic
@@ -10240,6 +10243,7 @@
 discontinous->discontinuous
 discontinuos->discontinuous
 discontinus->discontinue, discontinuous,
+discoraged->discouraged
 discouranged->discouraged
 discourarged->discouraged
 discourrage->discourage
@@ -14211,6 +14215,7 @@
 freqencies->frequencies
 freqency->frequency
 freqeuncy->frequency
+freqquency->frequency
 frequancies->frequencies
 frequancy->frequency
 frequant->frequent