Edit typo in server_side_encryption.rst

There was a typo that read 'SEE-C' instead of SSE-C

Author: israel-oye

doc/source/server_side_encryption.rst

@@ -27,7 +27,7 @@ source and for destination). Sync, however, accepts an `EncryptionSettingsProvid
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 High security: use unique keys
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-B2 cloud does not promote or discourage either reusing encryption keys or using unique keys for `SEE-C`.
+B2 cloud does not promote or discourage either reusing encryption keys or using unique keys for `SSE-C`.
 In applications requiring enhanced security, using unique key per file is a good strategy. **b2sdk** follows a convention,
 that makes managing such keys easier: `EncryptionSetting` holds a key identifier, aside from the key itself. This key
 identifier is saved in the metadata of all files uploaded, created or copied via **b2sdk** methods using `SSE-C`,