more links in B and rework the explanation of "slang"

docs/appendix-b-grouped.txt

@@ -7,8 +7,8 @@ Variables
 Sigils
 ------
 
-All variables in Perl begin with a sigil. They mark the 3 primary var
-types. The 4th sigil is for callables ([routines](appendix-g-glossary.html#routine))
+All variables in Perl begin with a sigil. They mark the 3 primary var types.
+The 4th sigil is for callables ([routines](appendix-g-glossary.html#routine))
 and the 5th is for layers (namespaces) that organize the previous 4.
 
 ------------------------------------------------  --------------------------------------------------------------------------------------------------------
@@ -357,6 +357,8 @@ Operators
 Table of Precedence
 -------------------
 
+all level of [*precedence*](appendix-g-glossary.html#precedence)
+
 A   Level              Examples
 --  -----------------  ----------------------------------------------------
 N   Terms              `42 3.14 "eek" qq["foo"] $x :!verbose @$array`
@@ -408,9 +410,12 @@ Categories
 
 ### MAIN ###
 
-These are the categories of the main language grammar, stored in $~MAIN.
-The first category is the metacategory that can used to produce new ones.
-Sublanguages such as quoting and regexes can provide their own.
+These are the categories of the main language
+[*grammar*](appendix-g-glossary.html#grammar),
+as stored in [**$~MAIN**](appendix-a-index.html#MAIN-slang-var).
+The first category called "category" is the metacategory
+(for all [*slangs*](appendix-g-glossary.html#slang))
+that can be used to create new categories.
 
 -----------------------------------------------------------------------------------------------------------
 [`category:<prefix>`](appendix-a-index.html#category-category)
@@ -446,7 +451,8 @@ Sublanguages such as quoting and regexes can provide their own.
 
 ### Regex ###
 
-The default Regex language as stored in $~Regex has following categories:
+The default [*regex*](appendix-g-glossary.html#regex) language as stored in 
+[**$~Regex**](appendix-a-index.html#Regex-slag-var) has following categories:
 
 ------------------------------------------------------------------------
 [`assertion:sym<!>`](appendix-a-index.html#assertion-category)

docs/appendix-g-glossary.txt

@@ -634,14 +634,16 @@ surrounded by round parentheses in the definition of a [*routine*](#routine)
 
 <a id="slang"/>
 **slang** &mdash;
-sublanguages of Perl 6, quoting or [*regular expression*](#regular expression)
-are completely independent languages, the grammar to parse them is mostly stored
-in [special variables](appendix-b-grouped.html#slang-variables)
-with the [*twigil*](#twigil) **\~**, 
-[**\$\~MAIN**](appendix-a-index.html#MAIN-lang-var) (main language),
-you can change or alter them by using the keyword 
-[**augment**](appendix-a-index.html#augment)
-or [**supersede**](appendix-a-index.html#supersede)
+Perl 6 is a family of languages containing the the main language,
+[*quoting*](#quoting), [*regular expressions*](#regular expression) and more.
+These sublanguages are called slangs.
+Each slang has a completely independent set of rules (a [*grammar*](#grammar))
+which is stored in a [slang variable](appendix-b-grouped.html#slang-variables).
+The slang variables have the [*twigil*](#twigil) **\~** like in 
+[**\$\~MAIN**](appendix-a-index.html#MAIN-lang-var) (main language).
+You can change or alter them by using the keywords 
+[**augment**](appendix-a-index.html#augment) and
+[**supersede**](appendix-a-index.html#supersede).
 
 <a id="slice"/>
 **slice** &mdash;
@@ -697,6 +699,9 @@ some of them were used so often, that their built into to language as
 a syntax "atom" like a pair of brackets, an [operator](#operator) or a value(4.32),
 not to be confused with [*expression*](#expression)
 
+<a id="terminator"/>
+**terminator** &mdash;
+
 <a id="test-method"/>
 **test method** &mdash;
 [test methods](appendix-b-grouped.html#test-methods).