[DOC] Rationalize aliases in What's Here

struct.c

@@ -2131,7 +2131,7 @@ rb_data_inspect(VALUE s)
  *  === Methods for Querying
  *
  *  - #hash: Returns the integer hash code.
- *  - #length, #size: Returns the number of members.
+ *  - #size (aliased as #length): Returns the number of members.
  *
  *  === Methods for Comparing
  *
@@ -2143,13 +2143,13 @@ rb_data_inspect(VALUE s)
  *  === Methods for Fetching
  *
  *  - #[]: Returns the value associated with a given member name.
- *  - #to_a, #values, #deconstruct: Returns the member values in +self+ as an array.
+ *  - #to_a (aliased as #values, #deconstruct): Returns the member values in +self+ as an array.
  *  - #deconstruct_keys: Returns a hash of the name/value pairs
  *    for given member names.
  *  - #dig: Returns the object in nested objects that is specified
  *    by a given member name and additional arguments.
  *  - #members: Returns an array of the member names.
- *  - #select, #filter: Returns an array of member values from +self+,
+ *  - #select (aliased as #filter): Returns an array of member values from +self+,
  *    as selected by the given block.
  *  - #values_at: Returns an array containing values for given member names.
  *
@@ -2164,7 +2164,7 @@ rb_data_inspect(VALUE s)
  *
  *  === Methods for Converting
  *
- *  - #inspect, #to_s: Returns a string representation of +self+.
+ *  - #inspect (aliased as #to_s): Returns a string representation of +self+.
  *  - #to_h: Returns a hash of the member name/value pairs in +self+.
  *
  */