CLDR-18938 Revamp spec modifications (unicode-org#5083)

Co-authored-by: Annemarie Apple <[email protected]>

Author: macchiati

docs/ldml/tr35-modifications.md

@@ -58,27 +58,58 @@ The LDML specification is divided into the following parts:
 **Changes in LDML Version 48 (Differences from Version 47)**
 
 ### Locale Identifiers
-* [Special Script Codes](tr35.md#special-script-codes) The `Hntl` compound script was added. (This is also reflected in the `<scriptData>` elements in supplementalData.xml.)
+* [Special Script Codes](tr35.md#special-script-codes) Added the `Hntl` compound script. (This is also reflected in the `<scriptData>` elements in supplementalData.xml.)
 
+### Misc.
+* [Character Elements](tr35-general.md#character-elements) Added new exemplar types.
+* [DTD Annotations](tr35.md#dtd_annotations) Added the @CDATA annotation, to indicate which elements are generated with @CDATA format
+* [Person Name Validation](tr35-personNames.md#person-name-validation) Added guidance for validating person names.
+
 ### DateTime formats
 
-* [Element dateTimeFormat](tr35-dates.md#dateTimeFormat) Added a new type `relative` and updated the
-guidelines on how to use the different `dateTimeFormat` types.
-* [Using Time Zone Names](tr35-dates.md#Using_Time_Zone_Names) The "specific location format" was removed.
+* [Element dateTimeFormat](tr35-dates.md#dateTimeFormat) Added a new type `relative` for relative date/times, such as "tomorrow at 10:00",
+and updated the guidelines for using the different `dateTimeFormat` types.
+* [Using Time Zone Names](tr35-dates.md#using-time-zone-names) Removed the "specific location format".
+* [timeZoneNames Elements Used for Fallback](tr35-dates.md#timeZoneNames-elements-used-for-fallback) Added the `gmtUnknownFormat`, to indicate when the timezone is unknown.
+* [Metazone Names](tr35-dates.md#metazone-names) Added `usesMetazone`, to specify which offset is considered standard time, and which offset is considered daylight.
+* [Time Zone Format Terminology](tr35-dates.md#time-zone-format-terminology) Added the **Localized GMT format** (replacing the **Specific location format**).
+This affects the behavior of the `z` timezone format symbol.
+There is also now a mechanism for finding the region code from short timezone identifier, which is used for the _non-location formats (generic or specific)_
+
+### Numbers
+* [Plural rules syntax](tr35-numbers.md#plural-rules-syntax) Added substantial clarifications and new examples.
+The order of execution is also clearly specified.
+* [Rule-Based Number Formatting]() Added a full specification.
+The rules have been converted to a “flat” format, which is easier for clients to handle (the old format will be retained for one more release).
+
+### Units of Measurement
+* [Unit Syntax](tr35-general.md#unit-syntax) Simplified the EBNF `product_unit`, and added an additional well-formedness constraint for a mixed units.
+* [Unit Identifier Normalization](#tr35-general.md) Modified the normalization process
+* [Mixed Units](tr35-general.md#mixed-units) Modified the guidance for handling precision.
+
+### Collation
+* [Collation](tr35-collation.md) Added the new `FractionalUCA_blanked.txt` to the root collation data files.
 
-Note that small changes such as typos and link fixes are not listed above.
-Modifications in previous versions are listed in those respective versions.
-Click on **Previous Version** in the header until you get to the desired version.
+### Keyboards
+__TBD Needs some cleanup for consistency__
+* A sentence was struck under the documentation of the [display](tr35-keyboards.md#element-display) element.
+A key without output may be indicated by means of the `keyId=` attribute on the display, which see.
+* A sentence was added under the [layer](tr35-keyboards.md#element-layer) element in the definition of the `modifiers=` attribute about hardware layouts being used as touch layouts.
+
+### Message Format
+* __TBD__
 
 ### Modifications section
 
-* This Modifications section was split out to its own part, [Appendix A, Modifications](tr35-modifications.md)
+* The Modifications section was split out to its own file, [Appendix A, Modifications](tr35-modifications.md)
 
-### Keyboards
+### Acknowledgments section
 
-* A sentence was struck under the documentation of the [display](tr35-keyboards.md#element-display) element. A key without output may be indicated by means of the `keyId=` attribute on the display, which see.
+* The Acknowledgments section was split out to its own file, [Acknowledgments](tr35-acknowledgments.md#acknowledgments)
 
-* A sentence was added under the [layer](tr35-keyboards.md#element-layer) element, in the definition of the `modifiers=` attribute about hardware layouts being used as touch layouts.
+Note that small changes such as typos and link fixes are not listed above.
+Modifications in previous versions are listed in those respective versions.
+Click on **Previous Version** in the header until you get to the desired version.
 
 * * *