Update Sandbox $10 entitlement window through end of July 2026 (#61862)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: timrogers <116134+timrogers@users.noreply.github.com>
Co-authored-by: hubwriter <hubwriter@github.com>

Author: 3 people

content/billing/concepts/billing-cycles.md

@@ -37,10 +37,10 @@ For example, if you started a paid plan or converted from a trial on the 15th of
 
 ## Billing cycle for {% data variables.copilot.sandbox %} during public preview
 
-During {% data variables.release-phases.public_preview %}, eligible accounts receive a **$10 monthly entitlement** for cloud sandbox usage in **June 2026**. The entitlement applies as follows:
+During {% data variables.release-phases.public_preview %}, eligible accounts receive a **$10 monthly entitlement** for cloud sandbox usage through the end of **July 2026**. The entitlement applies as follows:
 
 * Usage above the entitlement is metered against your standard billing cycle and billed on your normal billing date.
-* The entitlement is discontinued after June 2026. Pricing and packaging after the preview is subject to change.
+* The entitlement is discontinued after July 2026. Pricing and packaging after the preview is subject to change.
 
 ## Billing cycles for volume-based products
 

content/billing/concepts/product-billing/cloud-and-local-sandboxes.md

@@ -40,7 +40,7 @@ For more information about {% data variables.copilot.sandbox %}, see [AUTOTITLE]
 
 ## Free and billed use
 
-During public preview, eligible {% data variables.product.github %} accounts receive a **$10 monthly entitlement** to try cloud sandboxes. This entitlement is available for June 2026. Any usage beyond the monthly entitlement is billed to your account.
+During public preview, eligible {% data variables.product.github %} accounts receive a **$10 monthly entitlement** to try cloud sandboxes. This entitlement is available through the end of July 2026. Any usage beyond the monthly entitlement is billed to your account.
 
 After the preview period ends, the entitlement no longer applies and all usage is billed.