RFR: JDK-8305118: Add RISC-V related content to building.md [v2]

[Guoxiong Li]

On Thu, 30 Mar 2023 04:21:01 GMT, Chen Liang <liach at openjdk.org> wrote:

>> Guoxiong Li has updated the pull request incrementally with three additional commits since the last revision:
>> 
>>  - Add riscv64 related content to 'Debian sysroots'
>>  - qemu-debootstrap has been deprecated, use debootstrap instead.
>>  - Fix typos and adjust text width.
>
> doc/building.md line 1237:
> 
>> 1235: The RISC-V community provides a basic
>> 1236: [GNU compiler toolchain](https://github.com/riscv-collab/riscv-gnu-toolchain).
>> 1237: But the [external libraries](#External-Library-Requirements) required by OpenJDK
> 
> Suggestion:
> 
> However, the [external libraries](#External-Library-Requirements) required by OpenJDK
> 
> or change 'But' to ', but'

Fixed.

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PR Review Comment: https://git.openjdk.org/jdk/pull/13223#discussion_r1157954959