Fix docs license statements

Signed-off-by: Steve Winslow <[email protected]>

Author: swinslow

CONTRIBUTING.md

@@ -1,7 +1,9 @@
-SPDX-License-Identifier: GFDL-1.3-or-later
-
 # Contributing
 
+Copyright The Linux Foundation and each contributor to CommunityBridge.
+
+SPDX-License-Identifier: CC-BY-4.0
+
 All contributions must include a "Signed-off-by" line in the commit message, with the contributors' name and email address.
 
 This indicates that the contribution is made pursuant to the [Developer Certificate of Origin (DCO)](https://developercertificate.org/), a copy of which is included below.
@@ -14,10 +16,10 @@ New **code files** should include a [short-form SPDX ID](https://spdx.org/ids) a
 // SPDX-License-Identifier: AGPL-3.0-or-later
 ```
 
-New **documentation files** should include a [short-form SPDX ID](https://spdx.org/ids) at the top, indicating the project license for code, which is GFDL-1.3-or-later. This should look like the following:
+New **documentation files** should include a [short-form SPDX ID](https://spdx.org/ids) at the top, indicating the project license for code, which is CC-BY-4.0. This should look like the following:
 
 ```
-SPDX-License-Identifier: GFDL-1.3-or-later
+SPDX-License-Identifier: CC-BY-4.0
 ```
 
 ## Developer Certificate of Origin (DCO)

DEPLOY.md

@@ -1,7 +1,8 @@
 # CLA Deployment
 
 Copyright The Linux Foundation and each contributor to CommunityBridge.
-SPDX-License-Identifier: GFDL-1.3-or-later
+
+SPDX-License-Identifier: CC-BY-4.0
 
 The usual deployment flow begins with dev, which we deploy to when the feature or bug is ready for testing in an AWS environment. Once the changes are tested and appear complete, we deploy to staging for QA and acceptance. After the changes have been accepted, we deploy to prod.
 

DEV.md

@@ -1,7 +1,8 @@
 # CLA Local Development
 
 Copyright The Linux Foundation and each contributor to CommunityBridge.
-SPDX-License-Identifier: GFDL-1.3-or-later
+
+SPDX-License-Identifier: CC-BY-4.0
 
 ## Backend