[meta] Improve documentation.

meta.lua

@@ -1,4 +1,4 @@
---- Functions dealing with metatables and tables merging.
+--- Tables and metatables general utility algorithms.
 --
 -- @module gear.meta
 -- @copyright 2022 The DoubleFourteen Code Forge
@@ -7,7 +7,11 @@
 local meta = {}
 
 
---- Test whether 'obj' is an instance of a given class 'cls'.
+--- Test whether 'obj' is an instance of the given class 'cls'.
+--
+-- @tparam table obj
+-- @tparam table cls
+-- @treturn bool
 function meta.isinstance(obj, cls)
     repeat
         local m = getmetatable(obj)
@@ -25,6 +29,10 @@ end
 -- table 'to', whenever the same field is nil in that table.
 --
 -- The same process is applied recursively to sub-tables.
+--
+-- @tparam table to table to merge into
+-- @tparam table from table to merge from
+-- @treturn table destination table (a reference to 'to')
 function meta.mergetable(to, from)
     for k,v in pairs(from) do
         if to[k] == nil then