Merge pull request #76635 from mletalie/OSDOCS-10642

[OSDOCS-10642]: OSD-GCP Docs: Enable NVIDIA A100-enabled A2 8g and 16g machine type

Author: EricPonvelle

modules/sdpolicy-am-gcp-compute-types.adoc

@@ -88,4 +88,6 @@
 * a2-highgpu-1g (12 vCPU, 85 GiB)
 * a2-highgpu-2g (24 vCPU, 170 GiB)
 * a2-highgpu-4g (48 vCPU, 340 GiB)
+* a2-highgpu-8g (96 vCPU, 680 GiB)
+* a2-megagpu-16g (96 vCPU, 1.33 TiB)
 ====