[prman.dd] [intro.dd] [spec.ddoc] Few small fix. (#3169)

* add SUBNAV to this page

* add HEADERNAV_TOC to this page.
fix to LNAME2.

* fix SUBNAV_HEAD. (Required for 'narrow layouts')

* Fixed the anchor to lowercase.

Author: devmynote

foundation/prman.dd

@@ -90,3 +90,4 @@ $(UL
 
 Macros:
     TITLE=Pull-Request/Issue Manager Responsibilities
+    SUBNAV=$(SUBNAV_FOUNDATION)

spec/intro.dd

@@ -2,6 +2,8 @@ Ddoc
 
 $(SPEC_S Introduction,
 
+$(HEADERNAV_TOC)
+
 $(P D is a general-purpose systems programming language with a C-like syntax that compiles to native code.
 It is statically typed and supports both automatic $(LPAREN)garbage collected$(RPAREN) and manual memory management.
 D programs are structured as modules that can be compiled separately and linked with external libraries
@@ -10,7 +12,7 @@ to create native libraries or executables.)
 $(P This document is the reference manual for the D Programming Language. For more information and
 other documents$(COMMA) see $(LINK2 https://dlang.org/, The D Language Website).)
 
-$(H2 Phases of Compilation)
+$(H2 $(LNAME2 phases-of-compilation, Phases of Compilation))
 
 $(P The process of compiling is divided into multiple phases. Each phase is
 independent of subsequent phases. For example, the scanner is not affected by

spec/spec.ddoc

@@ -33,7 +33,7 @@ $(T style,
         counter-increment: h1;
         content: counter(h1) ". ";
     }
-    h2::before {
+    .hyphenate h2::before {
         counter-increment: h2;
         content: counter(h1) "." counter(h2) " ";
     }
@@ -57,7 +57,7 @@ $(T style,
     }
 )
 
-SUBNAV_HEAD = $(DIVC head, $(H5 $1) $(TC p, $4, $(LINK2 $2, $3)))
+SUBNAV_HEAD = $(DIVC head, $(H2 $1) $(TC p, $4, $(LINK2 $2, $3)))
 SUBNAV=$(SUBNAV_SPEC)
 SUBNAV_SPEC=
 $(SUBNAV_TEMPLATE