fix validation parameter and style

[rahul-amzn]

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Relates OR Closes #22401

Output from acceptance testing:

$ make testacc TESTS=TestAccVPCIpamPoolAllocation PKG=ec2 ACCTEST_PARALLELISM=1     
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ec2/... -v -count 1 -parallel 1 -run='TestAccVPCIpamPoolAllocation' -timeout 180m
=== RUN   TestAccVPCIpamPoolAllocation_ipv4Basic
=== PAUSE TestAccVPCIpamPoolAllocation_ipv4Basic
=== RUN   TestAccVPCIpamPoolAllocation_ipv4BasicNetmask
=== PAUSE TestAccVPCIpamPoolAllocation_ipv4BasicNetmask
=== CONT  TestAccVPCIpamPoolAllocation_ipv4Basic
--- PASS: TestAccVPCIpamPoolAllocation_ipv4Basic (119.37s)
=== CONT  TestAccVPCIpamPoolAllocation_ipv4BasicNetmask
--- PASS: TestAccVPCIpamPoolAllocation_ipv4BasicNetmask (115.20s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/ec2        237.762s

...

[rahul-amzn]

@drewmullen @GlennChia can you please review? Thanks!

[rahul-amzn]

Proposing change to expand cidr and netmask_length attributes netmask to a minimum of 0 and maximum of 32.

[drewmullen]

2 changes proposed.

1. chagelog type
2. Can you add a note to the end the attribute description detailing the valid values 0-32? Example of how those looks here

LGTM once those are done!

[drewmullen]

LGTM!

[ewbankkit]

LGTM 🚀.

% make testacc TESTS=TestAccVPCIpamPoolAllocation PKG=ec2 ACCTEST_PARALLELISM=1
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ec2/... -v -count 1 -parallel 1 -run='TestAccVPCIpamPoolAllocation' -timeout 180m
=== RUN   TestAccVPCIpamPoolAllocation_ipv4Basic
=== PAUSE TestAccVPCIpamPoolAllocation_ipv4Basic
=== RUN   TestAccVPCIpamPoolAllocation_ipv4BasicNetmask
=== PAUSE TestAccVPCIpamPoolAllocation_ipv4BasicNetmask
=== CONT  TestAccVPCIpamPoolAllocation_ipv4Basic
--- PASS: TestAccVPCIpamPoolAllocation_ipv4Basic (80.48s)
=== CONT  TestAccVPCIpamPoolAllocation_ipv4BasicNetmask
--- PASS: TestAccVPCIpamPoolAllocation_ipv4BasicNetmask (67.32s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ec2	151.379s

[github-actions]

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[github-actions]

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