Memory64 spec tweaks and fixes from @rossberg (#98)

- Removed unnecessary/mismatching lookup of table/memory type in execution prose
- Added missing result type lookup in formal rule for table.size and memory.size
- Fixed computation of -1 result value for table.grow and table.size to work for i64
- Some fixes around specification of text format for inline elements/data shorthand
- Fixed matching rules for tabletype/memtype to enforce same address type

Split out from WebAssembly#1839

document/core/binary/types.rst

@@ -251,7 +251,7 @@ Additional shorthands are recognized for unary recursions and sub types without
 Limits
 ~~~~~~
 
-:ref:`Limits <syntax-limits>` are encoded with a preceding flag indicating whether a maximum is present, and the corresponding :ref:`address type <syntax-addrtype>`.
+:ref:`Limits <syntax-limits>` are encoded with a preceding flag indicating whether a maximum is present, and a flag for the :ref:`address type <syntax-addrtype>`.
 
 .. math::
    \begin{array}{llclll}
@@ -275,7 +275,7 @@ Memory Types
 .. math::
    \begin{array}{llclll@{\qquad\qquad}l}
    \production{memory type} & \Bmemtype &::=&
-     (\X{at}, \X{lim}){:}\Blimits &\Rightarrow& \X{at}~~\X{lim} \\
+     (\X{at},\X{lim}){:}\Blimits &\Rightarrow& \X{at}~\X{lim} \\
    \end{array}
 
 
@@ -291,7 +291,7 @@ Table Types
 .. math::
    \begin{array}{llclll}
    \production{table type} & \Btabletype &::=&
-     \X{et}{:}\Breftype~~(\X{at}, \X{lim}){:}\Blimits &\Rightarrow& \X{at}~~\X{lim}~\X{et} \\
+     \X{et}{:}\Breftype~~(\X{at},\X{lim}){:}\Blimits &\Rightarrow& \X{at}~\X{lim}~\X{et} \\
    \end{array}