Remove DTrace Info

There is a generic section on how to generate the .y/.l files.

src/SUMMARY.md

@@ -42,7 +42,6 @@
   - [Packaging](contributing/packaging.md)
   - [Updating sources](contributing/updating-sources/README.md)
     - [BerkeleyDB](contributing/updating-sources/berkeleydb.md)
-    - [dtrace](contributing/updating-sources/dtrace.md)
     - [ICU](contributing/updating-sources/icu.md)
     - [JavaScriptCore](contributing/updating-sources/javascriptcore.md)
     - [libc](contributing/updating-sources/libc.md)

src/contributing/updating-sources/README.md

@@ -72,7 +72,6 @@ Like it was mentioned earlier, most projects require additional modifications an
 The following are links to more specific update requirement guides for subprojects that need them. Note that these document what has had to be done until now; the upstream sources *could* completely switch up their setup from one version to the next, but until now, project structures have been pretty stable. Nonetheless, these are still *guidelines*; whenever sources are updated, you need to make sure to review them and perform any additional steps as necessary (and if possible, please document them).
 
   * [BerkeleyDB](berkeleydb.md)
-  * [dtrace](dtrace.md)
   * [ICU](icu.md)
   * [JavaScriptCore](javascriptcore.md)
   * [libc](libc.md)

src/contributing/updating-sources/dtrace.md

@@ -1,14 +0,0 @@
-# Additional Update Guidelines for dtrace
-
-As a reminder, these are *guidelines*. The version you update to might make some of these steps obsolete, so make sure you understand what they do and why they're necessary.
-
-## Generates Sources
-
-_In the prior release, the source files were generated by XCode and copied over. If you are able to figure out how to build dtrace from XCode, you can copy over those generated files instead._
-
-```bash sh
-mkdir -p gen/libdtrace
-cd gen/libdtrace
-bison -b y -d ../../lib/libdtrace/common/dt_grammar.y
-flex ../../lib/libdtrace/common/dt_lex.l
-```