fixing small typo (quay#1387)

Author: diksha1999

modules/understanding-configuration-file.adoc

@@ -8,7 +8,7 @@
 [id="understanding-configuration-file"]
 = Understanding the {productname} configuration file
 
-Whether deployed on premise of by the {productname-ocp} Operator, the registry's behavior is defined by the `config.yaml` file. The `config.yaml` file must include all required configuration fields for the registry to start. {productname} administrators can also define optional parameters that customize their registry, such as authentication parameters, storage parameters, proxy cache parameters, and so on.
+Whether deployed on premise or by the {productname-ocp} Operator, the registry's behavior is defined by the `config.yaml` file. The `config.yaml` file must include all required configuration fields for the registry to start. {productname} administrators can also define optional parameters that customize their registry, such as authentication parameters, storage parameters, proxy cache parameters, and so on.
 
 The `config.yaml` file must be written using valid YAML ("YAML Ain't Markup Language") syntax, and {productname} cannot start if the file itself contains any formatting errors or missing required fields. Regardless of deployment type, whether that is on premise or {productname-ocp} that is configured by the Operator, the YAML principles stay the same, even if the required configuration fields are slightly different.