CLDR-10472 clarify literacy rate wording (#5183)

DavidLRowe · web-flow · commit 8e0becdbacc1 · 2025-11-08T09:55:40.000-09:00
diff --git a/tools/cldr-code/src/main/resources/org/unicode/cldr/util/data/chart_messages.html b/tools/cldr-code/src/main/resources/org/unicode/cldr/util/data/chart_messages.html
@@ -54,17 +54,21 @@ <h1 align="center">Chart Messages</h1>
 					<p>
 						Language population estimates come from various sources.
 						In general, they are meant to represent the number of people that speak the language in they given country.
-						When possible, the numbers include usage as both people's first language (L1) or a later language (L2, L3...) they could use in conversation or technology.
+						When possible, the numbers include usage as both people's first language (L1) or a later language (L2, L3...)
+						they could use in conversation or technology.
 						Not all numbers may be up-to-date or completely comparable, as the data is collected from various sources. 
 						Much of the data is sourced by per-country census data or Ethnologue.
 					</p>
 					<p>
 						Literacy figures are taken from <a href="https://www.cia.gov/the-world-factbook/field/literacy/">The World Factbook</a>
 						data and the <a href="https://data.un.org/Data.aspx?d=POP&f=tableCode%3a31">United Nations Statistics Division</a>.
+						In the absence of literacy rate figures for the specific language,
+						the country literacy rate is used for the "Literacy %" column.
+						The "Written %" column is an estimate of the use of the written form of the language.
 						The literacy rate may be discounted to reflect the actual usage of
 						the written form in normal daily life. Thus languages that are
 						typically not written, such as Swiss German, will be given a low
-						literacy rate, even though the whole population <i>could</i> write
+						rate, even though the whole population <i>could</i> write
 						in Swiss German.
 					</p>
 					<p>
@@ -451,8 +455,10 @@ <h1 align="center">Chart Messages</h1>
 							are not comprehensive: “0, 2~19, 101~119, …” could show up as the less-complete
 							“0, 2~16, 101 …”.</li>
 						<li><strong>Rules:</strong> The plural categories are computed based on machine-readable rules, 
-						using the syntax described in <a href="http://unicode.org/reports/tr35/tr35-numbers.html#Language_Plural_Rules" target='spec'>Language Plural Rules</a>. 
-						In particular, they use special variables and relation defined in <a href="http://unicode.org/reports/tr35/tr35-numbers.html#Operands" target='spec'>Plural Rule Operands</a>
+						using the syntax described in
+						<a href="http://unicode.org/reports/tr35/tr35-numbers.html#Language_Plural_Rules" target='spec'>Language Plural Rules</a>. 
+						In particular, they use special variables and relation defined in
+						<a href="http://unicode.org/reports/tr35/tr35-numbers.html#Operands" target='spec'>Plural Rule Operands</a>
 						and following.</li>
 						<li><b>Reporting Defects:</b> When you find errors or
 							omissions in this data, please report the information with a <a
