docs: minor fixes to API docs (#30480)

Signed-off-by: Ali Beyad <abeyad@google.com>

Mirrored from https://github.com/envoyproxy/envoy @ 0e22afd8555b11b35cd4e0568c4b1507e2391907

API_VERSIONING.md

@@ -87,7 +87,7 @@ no field will ever be removed nor will Envoy ever remove the implementation for
 field.
 
 **NOTE**: Client implementations are free to output additional warnings about field usage beyond
-deprecation, if for example, the use of the continued use of the field is deemed a substantial
+deprecation, if for example, the continued use of the field is deemed a substantial
 security risk. Individual client versions are also free to stop supporting fields if they want to,
 though Envoy Proxy (as an xDS client) commits to never doing so.
 

STYLE.md

@@ -162,7 +162,7 @@ To add an extension config to the API, the steps below should be followed:
    [source/extensions/extensions_build_config.bzl](../source/extensions/extensions_build_config.bzl) or [contrib/contrib_build_config.bzl](../contrib/contrib_build_config.bzl)
    to include the new extension.
 1. If the extension is not hidden, find or create a docs file with a toctree
-   and to reference your proto to make sure users can navigate to it from the API docs
+   and reference your proto to make sure users can navigate to it from the API docs
    (and to not break the docs build), like [docs/root/api-v3/admin/admin.rst](../docs/root/api-v3/admin/admin.rst).
 1. Run `./tools/proto_format/proto_format.sh fix`. **Before running the script**, you will need to **commit your local changes**. By adding the commit, the tool will recognize the change, and will regenerate the `BUILD` file and reformat `foobar.proto` as needed. If you have not followed any of the above steps correctly `proto_format.sh` may remove some of the files that you added. If that is the case you can revert to the committed state, and try again once any issues are resolved.
 1. See the [key-value-store PR](https://github.com/envoyproxy/envoy/pull/17745/files) for an example of adding a new extension point to common.