docs: Replace remove_webcore_debug_symbols with blink_symbol_level=0

remove_webcore_debug_symbols is deprecated.

Bug: none
Change-Id: I85a5ec66f10b94fb5949e932601743d479a9a178
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1518753
Auto-Submit: James Cook <[email protected]>
Commit-Queue: Takuto Ikuta <[email protected]>
Reviewed-by: Takuto Ikuta <[email protected]>
Cr-Commit-Position: refs/heads/master@{#640123}
diff --git a/docs/windows_build_instructions.md b/docs/windows_build_instructions.md
index ea94a7b..5fc56ef0 100644
--- a/docs/windows_build_instructions.md
+++ b/docs/windows_build_instructions.md
@@ -243,7 +243,7 @@
 * `target_cpu = "x86"` - x86 builds are slightly faster than x64 builds and
 support incremental linking for more targets. Note that if you set this but
 don't' set enable_nacl = false then build times may get worse.
-* `remove_webcore_debug_symbols = true` - turn off source-level debugging for
+* `blink_symbol_level = 0` - turn off source-level debugging for
 blink to reduce build times, appropriate if you don't plan to debug blink.
 
 In order to speed up linking you can set `symbol_level = 1` - this option