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Minor improvement to `riscv expose_custom` docs. (#579) 

* Minor improvement to `riscv expose_custom` docs.

Change-Id: Idba63368a147111af7b0a8b15aab5d9d653b9a6d
Signed-off-by: Tim Newsome <tim@sifive.com>

* Document name info for `riscv expose_csrs`.

Change-Id: I18b542df42255467dd906e32bd9d1214d1db0743
Signed-off-by: Tim Newsome <tim@sifive.com>
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doc/openocd.texi
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@ -9987,7 +9987,10 @@ external tools can gather the data efficiently.
@deffn Command {riscv expose_csrs} n[-m|=name] [...]
Configure which CSRs to expose in addition to the standard ones. The CSRs to expose
can be specified as individual register numbers or register ranges (inclusive). For the
individually listed CSRs, a human-readable name can optionally be set.
individually listed CSRs, a human-readable name can optionally be set, which
will get csr_ prepended to it. If no name is provided, the register will be
named csr<n>.
This command must be executed before `init`.
By default OpenOCD attempts to expose only CSRs that are mentioned in a spec,
@ -10001,7 +10004,10 @@ The RISC-V Debug Specification allows targets to expose custom registers
through abstract commands. (See Section 3.5.1.1 in that document.) This command
configures individual registers or register ranges (inclusive) that shall be exposed.
Number 0 indicates the first custom register, whose abstract command number is 0xc000.
For individually listed registers, a human-readable name can be optionally provided.
For individually listed registers, a human-readable name can be optionally provided,
which will get custom_ prepended to it. If no name is provided, the register will
be named custom<n>.
This command must be executed before `init`.
@end deffn