Update 'values.yaml' (#394)

### Description of the change

Corrects the spelling of the word deprecated.

### Benefits

Documentation free of misspelled words is more likely to be viewed as "professional".

### Possible drawbacks

None that I can think of

### Applicable issues

- fixes #393

### Additional information

There may be other misspelled words or incorrectly phrased passages that aren't addressed in this PR.

For reference, see the online dictionary for the correct spelling of deprecated.

https://www.merriam-webster.com/dictionary/deprecated

### Checklist

- [X] Parameters are documented in the `values.yaml` and added to the `README.md` using [readme-generator-for-helm](https://github.com/bitnami-labs/readme-generator-for-helm)
- [X] Breaking changes are documented in the `README.md`

Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/394
Reviewed-by: pat-s <pat-s@noreply.gitea.io>
Reviewed-by: justusbunsi <justusbunsi@noreply.gitea.io>
Co-authored-by: robv89r <robv8r@noreply.gitea.io>
Co-committed-by: robv89r <robv8r@noreply.gitea.io>

values.yaml

@@ -63,7 +63,7 @@ containerSecurityContext: {}
 #   runAsNonRoot: true
 #   runAsUser: 1000
 
-## @depracated The securityContext variable has been split two:
+## @deprecated The securityContext variable has been split two:
 ## - containerSecurityContext
 ## - podSecurityContext.
 ## @param securityContext Run init and Gitea containers as a specific securityContext
@@ -228,7 +228,7 @@ extraContainerVolumeMounts: []
 ## @param extraInitVolumeMounts Mounts that are only mapped into the init-containers. Can be used for additional preconfiguration.
 extraInitVolumeMounts: []
 
-## @depracated The extraVolumeMounts variable has been split two:
+## @deprecated The extraVolumeMounts variable has been split two:
 ## - extraContainerVolumeMounts
 ## - extraInitVolumeMounts
 ## As an example, can be used to mount a client cert when connecting to an external Postgres server.