Errata for "LLVM Assembly Language" docs (llvm.org/docs/LangRef.html)

[Bcc: Chris Lattner, who's listed in the "Written by"; the doc doesn't
have a maintainer listed]

I was reading http://llvm.org/docs/LangRef.html today and found some
errors (or at least places where the text could be clearer). This is
*NOT* an exhaustive reading; I'm just reporting the bugs I found in a
casual reading of the intro and skimming the rest. I'm operating on
the theory that reporting even a small number of errata is better than
leaving them in forever.

(1) LangRef.html writes:

Identifiers which require other characters in their names can be surrounded with quotes.
Special characters may be escaped using "\xx" where xx is the ASCII code for the character
in hexadecimal. In this way, any character can be used in a name value, even quotes themselves.

I would add an example to clarify where the quotation marks go, since
it's non-obvious. Like so:

For example, the names %"a=b", %"a\3db", and %"a\3Db" all identify the same variable.

(2) LangRef.html writes:

This last way of multiplying %X by 8 illustrates several important lexical features of LLVM:
    Comments are delimited with a ';' and go until the end of line.
    Unnamed temporaries are created when the result of a computation is not assigned to a named value.
    Unnamed temporaries are numbered sequentially

The second two bullet points don't seem to be describing "lexical
features of LLVM"; they're describing semantic features of the Clang
LLVM backend. I think a more correct *and* more informative phrasing
would be

This last way of multiplying %X by 8 illustrates several important lexical features of LLVM:
    Comments are delimited with a ';' and go until the end of line.
    The result of each (non-void) computation may be assigned to a variable, which may be named or unnamed.
    By convention, unnamed temporary variables are numbered sequentially from %0.

(3) LangRef.html writes:

If the unnamed_addr attribute is given, the address is know to not be significant and two identical functions can be merged.

s/know/known/

Thanks,
-Arthur