Change all explicitly created <a name="..."> anchors to lowercase (#2304)

GitHub Flavored Markdown requires these anchors to be all-lowercase for
markdown-style links within the document to work.

Also change one anchor that uses '*' which isn't valid in HTML or
Markdown.

And rename duplicate anchor res-macros to res-macros3.

scripts/hunspell/isocpp.dic

@@ -73,6 +73,7 @@ cbegin
 CComPtr
 cend
 cerr
+charp
 chrono
 cin
 Clang's
@@ -104,6 +105,7 @@ CppCoreCheck
 cppcoreguidelines
 cppreference
 CRTP
+cr
 cst
 cstdarg
 cstdio
@@ -241,6 +243,7 @@ JSF
 jthread
 Juhl
 knr
+knuth
 Koenig97
 Lakos
 Lakos96
@@ -261,6 +264,7 @@ m1
 m2
 m3
 macros2
+macros3
 malloc
 mallocfree
 Mathematizing
@@ -374,16 +378,17 @@ ptr2
 q2
 qqq
 qsort
-R0
+r0
 r2
+ra
 raii
-Rc
+rc
-Rclib
+rclib
-Rcon
+rcon
-Rconc
+rconc
-Rconst
+rconst
 rcoro
-Rcpl
+rcpl
 Rec2
 refactor
 refactored
@@ -395,7 +400,7 @@ reimplement
 reinterpretcast
 Reis
 Reis's
-Renum
+renum
 reseat
 reseating
 reseats
@@ -405,17 +410,21 @@ rethrowing
 retryable
 *Re-usability
 reusability
-Ri
+rf
-Rl
+rh
-Rnr
+ri
-Ro
+rio
+rl
+rnr
+ro
 Rouquette
-Rp
+rp
-Rper
+rper
 rr
-Rsl
+rsl
-Rstr
+rstr
 RTTI
+ru
 rvalue
 rvalues
 RVO
@@ -426,7 +435,7 @@ s2
 s3
 Sarkar
 scanf
-Sd
+sd
 SEI
 semiregular
 SemiRegular
@@ -453,7 +462,8 @@ specialization2
 spinlock
 splonk
 splunk
-SScp
+ss
+sscp
 stdarg
 stdlib
 Stepanov