[gimp] devel-docs: remove old performance-logs-parameters section

[Ell <ell src gnome org>]

commit ca6f5774139f69b668fc9dd9149284ba0132cbf9
Author: Ell <ell_se yahoo com>
Date:   Thu Jul 30 18:19:22 2020 +0300

    devel-docs: remove old performance-logs-parameters section

 devel-docs/performance-logs/performance-logs.md | 18 ------------------
 1 file changed, 18 deletions(-)
---
diff --git a/devel-docs/performance-logs/performance-logs.md b/devel-docs/performance-logs/performance-logs.md
index 66640c1d8f..b0876d0ee2 100644
--- a/devel-docs/performance-logs/performance-logs.md
+++ b/devel-docs/performance-logs/performance-logs.md
@@ -643,22 +643,4 @@ The following environment variables are used by the viewer:
     and line number, respectively.
     If the variable is not defined, a default text editor is used.
 
-## 5. Performance-Log Parameters
-
-
-A number of parameters affect performance-log generation.
-They may be currently specified as environment variables for GIMP:
-
-  - *`sample-frequency`*:
-    The log's sampling frequency, in samples per second.
-    The default value is 10 samples per second, but it can be changed using the
-    `GIMP_PERFORMANCE_LOG_SAMPLE_FREQUENCY` environment variable.
-
-  - *`backtrace`*:
-    Specifies whether backtraces are included in the log.
-    By default, backtraces are included on supported platforms (currently,
-    Linux and Windows).
-    Backtraces may be suppressed by defining the
-    `GIMP_PERFORMANCE_LOG_NO_BACKTRACE` environment variable.
-
 [new-performance-issue]: https://gitlab.gnome.org/GNOME/gimp/issues/new?issuable_template=performance