docs: Consistent index entries for literals, denominations, free functions

docs/contracts/functions.rst

@@ -1,4 +1,4 @@
-.. index:: ! functions
+.. index:: ! functions, ! function;free
 
 .. _functions:
 

docs/contracts/using-for.rst

@@ -1,4 +1,4 @@
-.. index:: ! using for, library, ! operator; user-defined
+.. index:: ! using for, library, ! operator;user-defined, function;free
 
 .. _using-for:
 

docs/control-structures.rst

@@ -173,7 +173,6 @@ parameters from the function declaration, but can be in arbitrary order.
         function set(uint key, uint value) public {
             data[key] = value;
         }
-
     }
 
 Omitted Names in Function Definitions

docs/types/conversion.rst

@@ -130,6 +130,7 @@ If the array is shorter than the target type, it will be padded with zeros at th
         }
     }
 
+.. index:: ! literal;conversion, literal;rational, literal;hexadecimal number
 .. _types-conversion-literals:
 
 Conversions between Literals and Elementary Types
@@ -152,6 +153,8 @@ that is large enough to represent it without truncation:
     converted to an integer type. From 0.8.0, such explicit conversions are as strict as implicit
     conversions, i.e., they are only allowed if the literal fits in the resulting range.
 
+.. index:: literal;string, literal;hexadecimal
+
 Fixed-Size Byte Arrays
 ----------------------
 
@@ -182,6 +185,8 @@ if their number of characters matches the size of the bytes type:
     bytes2 e = "x"; // not allowed
     bytes2 f = "xyz"; // not allowed
 
+.. index:: literal;address
+
 Addresses
 ---------
 

docs/types/reference-types.rst

@@ -235,7 +235,7 @@ with the :ref:`default value<default-value>`.
         }
     }
 
-.. index:: ! array;literals, ! inline;arrays
+.. index:: ! literal;array, ! inline;arrays
 
 Array Literals
 ^^^^^^^^^^^^^^

docs/types/value-types.rst

@@ -423,7 +423,7 @@ Dynamically-sized byte array
 ``string``:
     Dynamically-sized UTF-8-encoded string, see :ref:`arrays`. Not a value-type!
 
-.. index:: address, literal;address
+.. index:: address, ! literal;address
 
 .. _address_literals:
 
@@ -439,7 +439,7 @@ an error. You can prepend (for integer types) or append (for bytesNN types) zero
 .. note::
     The mixed-case address checksum format is defined in `EIP-55 <https://github.com/ethereum/EIPs/blob/master/EIPS/eip-55.md>`_.
 
-.. index:: literal, literal;rational
+.. index:: integer, rational number, ! literal;rational
 
 .. _rational_literals:
 
@@ -517,7 +517,7 @@ regardless of the type of the right (exponent) operand.
     uint128 a = 1;
     uint128 b = 2.5 + a + 0.5;
 
-.. index:: literal, literal;string, string
+.. index:: ! literal;string, string
 .. _string_literals:
 
 String Literals and Types
@@ -564,6 +564,8 @@ character sequence ``abcdef``.
 Any Unicode line terminator which is not a newline (i.e. LF, VF, FF, CR, NEL, LS, PS) is considered to
 terminate the string literal. Newline only terminates the string literal if it is not preceded by a ``\``.
 
+.. index:: ! literal;unicode
+
 Unicode Literals
 ----------------
 
@@ -574,7 +576,7 @@ They also support the very same escape sequences as regular string literals.
 
     string memory a = unicode"Hello 😃";
 
-.. index:: literal, bytes
+.. index:: ! literal;hexadecimal, bytes
 
 Hexadecimal Literals
 --------------------

docs/units-and-global-variables.rst

@@ -1,8 +1,10 @@
+.. index:: ! denomination
+
 **************************************
 Units and Globally Available Variables
 **************************************
 
-.. index:: wei, finney, szabo, gwei, ether
+.. index:: ! wei, ! finney, ! szabo, ! gwei, ! ether, ! denomination;ether
 
 Ether Units
 ===========
@@ -21,7 +23,7 @@ The only effect of the subdenomination suffix is a multiplication by a power of
 .. note::
     The denominations ``finney`` and ``szabo`` have been removed in version 0.7.0.
 
-.. index:: time, seconds, minutes, hours, days, weeks, years
+.. index:: ! seconds, ! minutes, ! hours, ! days, ! weeks, ! years, ! denomination;time
 
 Time Units
 ==========
@@ -52,7 +54,7 @@ interpret a function parameter in days, you can in the following way:
 
     function f(uint start, uint daysAfter) public {
         if (block.timestamp >= start + daysAfter * 1 days) {
-          // ...
+            // ...
         }
     }
 

docs/yul.rst

@@ -166,6 +166,8 @@ Inside a code block, the following elements can be used
 Multiple syntactical elements can follow each other simply separated by
 whitespace, i.e. there is no terminating ``;`` or newline required.
 
+.. index:: ! literal;in Yul
+
 Literals
 --------