Update symbols docs

Summary: Refs T7977.

Test Plan: spellcheck.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin, epriestley

Maniphest Tasks: T7977

Differential Revision: https://secure.phabricator.com/D12688

src/docs/user/userguide/diffusion_symbols.diviner

@@ -9,7 +9,8 @@ Phabricator can maintain a symbol index, which keeps track of where classes
 and functions are defined in the codebase. Once you set up indexing, you can
 use the index to do things like:
 
-  - link symbol uses in Differential code reviews to their definitions
+  - link symbol uses in Differential code reviews and Diffusion code browsing
+    to their definitions
   - allow you to search for symbols
   - let the IRC bot answer questions like "Where is SomeClass?"
 
@@ -21,7 +22,7 @@ other languages.
 To populate the index, you need to write a script which identifies symbols in
 your codebase and set up a cronjob which pipes its output to:
 
-  ./scripts/symbols/import_project_symbols.php
+  ./scripts/symbols/import_repository_symbols.php
 
 Phabricator includes a script which can identify symbols in PHP projects:
 
@@ -61,34 +62,28 @@ write such a script, and run this command to see its output:
   $ find . -type f -name '*.php' | ./scripts/symbols/generate_php_symbols.php
 
 To actually build the symbol index, pipe this data to the
-`import_project_symbols.php` script, providing the project name:
+`import_repository_symbols.php` script, providing the repository callsign:
 
-  $ ./scripts/symbols/import_project_symbols.php yourproject < symbols_data
+  $ ./scripts/symbols/import_repository_symbols.php rREPO < symbols_data
 
 Then just set up a cronjob to run that however often you like.
 
 You can test that the import worked by querying for symbols using the Conduit
-method ##differential.findsymbols##. Some features (like that method, and the
+method ##diffusion.findsymbols##. Some features (like that method, and the
 IRC bot integration) will start working immediately. Others will require more
 configuration.
 
-= Configuring Differential Integration =
+= Advanced Configuration =
 
-To configure Differential integration, you need to tell Phabricator which
-projects have symbol indexes you want to use, and which other projects they
-should pull symbols from. To do this, go to
-{nav Repositories > Arcanist Projects > Edit} as an administrator. You need to
-fill out these fields:
+You can configure some more options by going to {nav Diffusion > (Select
+ repository) > Edit Repository > Edit Symbols}, and filling out these fields:
 
-  - **Repository**: Associate the project with a tracked repository.
   - **Indexed Languages**: Fill in all the languages you've built indexes for.
-  - **Uses Symbols From**: If this project depends on other projects, add the
-    other projects which symbols should be looked for here. For example,
+    You can leave this blank for "All languages".
+  - **Uses Symbols From**: If this project depends on other repositories, add
+    the other repositories which symbols should be looked for here. For example,
     Phabricator lists "Arcanist" and "libphutil" because it uses classes and
-    functions from these projects.
-
-Once you've configured a project, new revisions in that project will
-automatically link symbols in Differential.
+    functions from these repositories.
 
 NOTE: Because this feature depends on the syntax highlighter, it will work
 better for some languages than others. It currently works fairly well for PHP,