Record.FromList - undocumented/wrong how to use it?

On page 44 of power query language specification power query language it is mentioned that one can also contruct a record from a list
however when I try this
let
s={[Name="a",Value=1],[Name="b",Value=2]} ,
b=Record.FromList(s)
in
b
I get
Expression.Error: 1 arguments were passed to a function which expects 2.
Details:
Pattern=
Arguments=List
and I can't find a mention of this in the function categories list
BTW my overall goal is to convert from a column "keywords" with entries consisting of a single string representing a dictionary (eg
"gender:m,age:36" ) into a column of records ( and then expand column)
nb each row may have different keywords

Looks like we need to update the language specification and formula reference. Thanks for catching this!
In the Editor you can see what a library function should take by typing out the function name. For example, if you entered:
= Record.FromList
It will display the list of parameters it expects as well as some examples. For Record.FromList, the first parameter is a list of values and the second parameter is a list of names. For the example above, it would be:
= Record.FromList({1, 2}, {"a", "b"})
-Alejandro

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