CLDR-18031 spec: fix .html to .md

- part of running the ToC updater

docs/ldml/tr35-collation.md

@@ -537,7 +537,7 @@ A collation type name that starts with "private-", for example, "private-kana",
 
 > 👉 **Note**: There is an on-line demonstration of collation at [[LocaleExplorer](tr35.md#LocaleExplorer)] that uses the same rule syntax. (Pick the locale and scroll to "Collation Rules", near the end.)
 
-> 👉 **Note**: In CLDR 23 and before, LDML collation files used an XML format. Starting with CLDR 24, the XML collation syntax is deprecated and no longer used. See the _[CLDR 23 version of this document](tr35-collation.html#Collation_Tailorings)_ for details about the XML collation syntax.
+> 👉 **Note**: In CLDR 23 and before, LDML collation files used an XML format. Starting with CLDR 24, the XML collation syntax is deprecated and no longer used. See the _[CLDR 23 version of this document](tr35-collation.md#Collation_Tailorings)_ for details about the XML collation syntax.
 
 #### <a name="Collation_Type_Fallback" href="#Collation_Type_Fallback">Collation Type Fallback</a>
 

docs/ldml/tr35-general.md

@@ -591,11 +591,11 @@ The ordering of the characters in the set is irrelevant, but for readability in
 
 ### ~~<a name="Character_Mapping" href="#Character_Mapping">Mapping</a>~~
 
-**This element has been deprecated.** For information on its structure and how it was intended to specify locale-specific preferred encodings for various purposes (e-mail, web), see the [Mapping](tr35-general.html#Character_Mapping) section from the CLDR 27 version of the LDML Specification.
+**This element has been deprecated.** For information on its structure and how it was intended to specify locale-specific preferred encodings for various purposes (e-mail, web), see the [Mapping](tr35-general.md#Character_Mapping) section from the CLDR 27 version of the LDML Specification.
 
 ### ~~<a name="IndexLabels" href="#IndexLabels">Index Labels</a>~~
 
-**This element and its subelements have been deprecated.** For information on its structure and how it was intended to provide data for a compressed display of index exemplar characters where space is limited, see the [Index Labels](tr35-general.html#IndexLabels) section from the CLDR 27 version of the LDML Specification.
+**This element and its subelements have been deprecated.** For information on its structure and how it was intended to provide data for a compressed display of index exemplar characters where space is limited, see the [Index Labels](tr35-general.md#IndexLabels) section from the CLDR 27 version of the LDML Specification.
 
 ```xml
 <!ELEMENT indexLabels (indexSeparator*, compressedIndexSeparator*, indexRangePattern*, indexLabelBefore*, indexLabelAfter*, indexLabel*) >