add renaming proposal

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diff --git a/doc/proposals/2022-07-api-renaming.md b/doc/proposals/2022-07-api-renaming.md
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+# Proposal
+
+Rename the following endpoints:
+
+  - s/get-tree-head-to-cosign/get-untrusted-tree-head/
+  - s/get-tree-head-cosigned/get-tree-head/
+  - s/get-leaves/get-entries/
+  - s/add-leaf/add-entry/
+
+Rename the following ASCII keys:
+
+  - s/start_size/start_index/
+  - s/end_size/end_index/
+
+(Reminder: specify zero-based index.)
+
+# Motivation
+
+Improve readability of api.md, especially for those that skim it quickly.  For
+example, "untrusted-tree-head" is a very strong signal for what you don't want,
+and it should be easier to relate to the term "entry" rather than a "leaf".
+
+The renamed ASCII keys better reflect the text that describes them.