Merge bitcoin/bitcoin#31141: doc: Make list of targets in depends README consistent

a0c9595 doc: Make list of targets in depends README consistent (laanwj)

Pull request description:

  The description of `i686-pc-linux-gnu` and `x86_64-pc-linux-gnu` is incomplete and inconsistent with the others. Fix this. Also use "64 bit" consistently instead of "64-bit".

ACKs for top commit:
  maflcko:
    lgtm ACK a0c9595
  hebasto:
    ACK a0c9595.
  jarolrod:
    ACK a0c9595
  rkrux:
    ACK a0c9595

Tree-SHA512: eedefb19639dd08f25627ceaab0d2c3745b256e561e55f8506d14721d0236978f1b1bef79f9fe126b7f42d869887ca988d04b3536d98a27e0eb182f0a7f64183

Author: fanquake

depends/README.md

@@ -22,15 +22,15 @@ created. To use it during configuring Bitcoin Core:
 
 Common `host-platform-triplet`s for cross compilation are:
 
-- `i686-pc-linux-gnu` for Linux 32 bit
-- `x86_64-pc-linux-gnu` for x86 Linux
+- `i686-pc-linux-gnu` for Linux x86 32 bit
+- `x86_64-pc-linux-gnu` for Linux x86 64 bit
 - `x86_64-w64-mingw32` for Win64
 - `x86_64-apple-darwin` for macOS
 - `arm64-apple-darwin` for ARM macOS
 - `arm-linux-gnueabihf` for Linux ARM 32 bit
 - `aarch64-linux-gnu` for Linux ARM 64 bit
-- `powerpc64-linux-gnu` for Linux POWER 64-bit (big endian)
-- `powerpc64le-linux-gnu` for Linux POWER 64-bit (little endian)
+- `powerpc64-linux-gnu` for Linux POWER 64 bit (big endian)
+- `powerpc64le-linux-gnu` for Linux POWER 64 bit (little endian)
 - `riscv32-linux-gnu` for Linux RISC-V 32 bit
 - `riscv64-linux-gnu` for Linux RISC-V 64 bit
 - `s390x-linux-gnu` for Linux S390X