Drop gerbil-pcre2 references (dependency-shape credits)

ober

64a5866079648976125cbb849e32801708ac0fed

diff --git a/README.md b/README.md
index e8bc382..360e085 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # chez-pcre2
 
-PCRE2 bindings for Chez Scheme, providing API parity with [gerbil-pcre2](../gerbil-pcre2/).
+PCRE2 bindings for Chez Scheme, providing API parity with [pcre2-upstream](../pcre2-upstream/).
 
 ## Requirements
 
diff --git a/jerboa_pcre2_shim.c b/jerboa_pcre2_shim.c
index 1b3b7b7..56a2946 100644
--- a/jerboa_pcre2_shim.c
+++ b/jerboa_pcre2_shim.c
@@ -2,7 +2,7 @@
  *
  * Provides simplified C functions that wrap libpcre2-8 APIs,
  * using simpler calling conventions suitable for Chez's foreign-procedure.
- * Mirrors the C shim from gerbil-pcre2/libpcre2.ss.
+ * Mirrors the C shim from pcre2-upstream/libpcre2.ss.
  */
 
 #define PCRE2_CODE_UNIT_WIDTH 8
diff --git a/src/jerboa-pcre2/pcre2.ss b/src/jerboa-pcre2/pcre2.ss
index 92ae060..ee854ae 100644
--- a/src/jerboa-pcre2/pcre2.ss
+++ b/src/jerboa-pcre2/pcre2.ss
@@ -1,6 +1,6 @@
 ;;; pcre2.ss — High-level idiomatic Chez Scheme API for PCRE2
 ;;;
-;;; Provides API parity with gerbil-pcre2's pcre2/pcre2.ss:
+;;; Provides API parity with upstream PCRE2 module's pcre2/pcre2.ss:
 ;;;   - Compilation: pcre2-compile, pcre2-regex
 ;;;   - Matching: pcre2-match, pcre2-search, pcre2-matches?
 ;;;   - Match access: pcre-match-group, pcre-match-named, pcre-match-positions,