ICU-20469 Fixing typo: locale_tree -> locales_tree
diff --git a/docs/userguide/icu_data/buildtool.md b/docs/userguide/icu_data/buildtool.md
index 505a7c0..cebde5e 100644
--- a/docs/userguide/icu_data/buildtool.md
+++ b/docs/userguide/icu_data/buildtool.md
@@ -202,7 +202,7 @@
| Unicode Character <br/> Names | `"unames"` | in/unames.icu | 269 KiB |
| Unicode Text Layout | `"ulayout"` | in/ulayout.icu | 14 KiB |
| Units | `"unit_tree"` | unit/\*.txt | **1.7 MiB** |
-| **OTHER** | `"cnvalias"` <br/> `"misc"` <br/> `"locale_tree"` | mappings/convrtrs.txt <br/> misc/dayPeriods.txt <br/> misc/genderList.txt <br/> misc/numberingSystems.txt <br/> misc/supplementalData.txt <br/> locales/\*.txt | 63 KiB <br/> 19 KiB <br/> 0.5 KiB <br/> 5.6 KiB <br/> 228 KiB <br/> **2.4 MiB** |
+| **OTHER** | `"cnvalias"` <br/> `"misc"` <br/> `"locales_tree"` | mappings/convrtrs.txt <br/> misc/dayPeriods.txt <br/> misc/genderList.txt <br/> misc/numberingSystems.txt <br/> misc/supplementalData.txt <br/> locales/\*.txt | 63 KiB <br/> 19 KiB <br/> 0.5 KiB <br/> 5.6 KiB <br/> 228 KiB <br/> **2.4 MiB** |
#### Filter Types
