Fix ECDHE size comment

[ColtonWilley]

Do not merge yet, using for testing CI.

• Correct ECDHE size bounds and zero behavior (F-10632).

[github-actions]

MemBrowse Memory Report

gcc-arm-cortex-m0plus

• FLASH: .text +32 B (+0.0%, 67,847 B / 262,144 B, total: 26% used)

gcc-arm-cortex-m3

• FLASH: .text +52 B (+0.0%, 127,689 B / 262,144 B, total: 49% used)

gcc-arm-cortex-m4

• FLASH: .text +64 B (+0.0%, 206,444 B / 262,144 B, total: 79% used)

gcc-arm-cortex-m4-baremetal

• FLASH: .text +64 B (+0.1%, 70,307 B / 262,144 B, total: 27% used)

gcc-arm-cortex-m4-crypto-only

• FLASH: .text -64 B (-0.0%, 179,549 B / 262,144 B, total: 68% used)

gcc-arm-cortex-m4-dtls13

• FLASH: .text +192 B (+0.1%, 189,188 B / 1,048,576 B, total: 18% used)

gcc-arm-cortex-m4-min-ecc

• FLASH: .text +64 B (+0.1%, 65,093 B / 262,144 B, total: 25% used)

gcc-arm-cortex-m4-openssl-compat

• FLASH: .text -128 B (-0.0%, 787,868 B / 1,048,576 B, total: 75% used)

gcc-arm-cortex-m4-rsa-only

• FLASH: .text -64 B (-0.0%, 335,600 B / 1,048,576 B, total: 32% used)

gcc-arm-cortex-m4-sp-math

• FLASH: .text +64 B (+0.1%, 65,093 B / 262,144 B, total: 25% used)

gcc-arm-cortex-m4-tls12

• FLASH: .text +64 B (+0.0%, 128,445 B / 262,144 B, total: 49% used)

gcc-arm-cortex-m4-tls13

• FLASH: .text -64 B (-0.0%, 244,510 B / 262,144 B, total: 93% used)

gcc-arm-cortex-m7

• FLASH: .text +64 B (+0.0%, 206,444 B / 262,144 B, total: 79% used)

gcc-arm-cortex-m7-pq

• FLASH: .text -64 B (-0.0%, 305,048 B / 1,048,576 B, total: 29% used)

gcc-arm-cortex-m7-tls13

• FLASH: .text -64 B (-0.0%, 244,574 B / 262,144 B, total: 93% used)

linuxkm-pie

• Data: __patchable_function_entries +112 B (+0.4%, 27,960 B)

linuxkm-standard

• Data: __patchable_function_entries +128 B (+0.3%, 50,784 B)

stm32-sim-stm32h753

• FLASH: .text -192 B (-0.1%, 191,116 B / 2,097,152 B, total: 9% used)
  No memory changes detected for:
• gcc-arm-cortex-m4-pkcs7
• gcc-arm-cortex-m4-pq

[ColtonWilley]

Jenkins retest this please