gnu: Fix various synopsis issues.

* gnu/packages/crates-io.scm (rust-rug-1)[synopsis]: Shorten.
  (rust-simplelog-0.11)[synopsis]: Fix case.
  (rust-tikv-jemalloc-ctl-0.4)[synopsis]: Fix case.
  (rust-ucd-util-0.1)[synopsis]: Fix case.
* gnu/packages/kde.scm (kuserfeedback)[synopsis]: Shorten.
* gnu/packages/tex.scm (texlive-generic-pdfescape)[synopsis]: Reword to fix
  case issue.

gnu/packages/crates-io.scm

@@ -46689,8 +46689,7 @@ table-based tests.")
      (list bash-minimal m4))
     (home-page "https://gitlab.com/tspiteri/rug")
     (synopsis
-      "Arbitrary-precision integers, rational, floating-point and complex numbers based
-on GMP, MPFR and MPC")
+      "Arbitrary-precision integers, rational, floating-point and complex numbers")
     (description "This is a Rust library of arbitrary-precision integers, rational,
 floating-point, and complex numbers based on GMP, MPFR and MPC.")
     (license license:lgpl3+)))
@@ -52506,7 +52505,7 @@ diff output.")
         ("rust-paris" ,rust-paris-1)
         ("rust-termcolor" ,rust-termcolor-1))))
     (home-page "https://github.com/drakulix/simplelog.rs")
-    (synopsis "simple and easy-to-use logging facility for Rust's log crate")
+    (synopsis "Simple and easy-to-use logging facility for Rust's log crate")
     (description
      "This package provides a simple and easy-to-use logging facility for Rust's
 @code{log} crate.  It aims to be a maintainable, easy to integrate facility for
@@ -58461,7 +58460,7 @@ fixed set of worker threads.")
     (home-page
      "https://github.com/tikv/jemallocator")
     (synopsis
-     "safe wrapper over jemalloc's control and introspection APIs")
+     "Safe wrapper over jemalloc's control and introspection APIs")
     (description
      "This package provides a safe wrapper over jemalloc's control and
 introspection APIs.")
@@ -62761,7 +62760,7 @@ Unicode character database.")
           "13ng291mkc9b132jjf4laj76f5nqm5qd2447rm8bry3wxbdc5kaw"))))
     (build-system cargo-build-system)
     (home-page "https://github.com/BurntSushi/ucd-generate")
-    (synopsis "library for working with the Unicode character database")
+    (synopsis "Library for working with the Unicode character database")
     (description "This package provides a small utility library for working
 with the Unicode character database.")
     (license (list license:asl2.0

gnu/packages/kde.scm

@@ -1256,8 +1256,8 @@ or Bonjour by other projects).")
     (arguments
      `(#:tests? #f))  ;; 4/17 fail
     (home-page "https://api.kde.org/frameworks/kuserfeedback/html/")
-    (synopsis "Framework for collecting application feedback via
-telemetry and targeted surveys")
+    (synopsis "Collect application feedback via telemetry and targeted
+surveys")
     (description "This framework consists of the following components:
 @itemize
 @item Libraries for use in applications.

gnu/packages/tex.scm

@@ -8932,7 +8932,7 @@ as plain TeX.")
                "1vbdjmm9bi9ngzz2z1b8jnf6nzf9xsaj5pvyswg13y4dr00mnz6n")
               #:trivial? #t))
     (home-page "https://www.ctan.org/pkg/pdfescape")
-    (synopsis "pdfTeX's escape features for plain TeX")
+    (synopsis "Use escape features from pdfTeX with plain TeX")
     (description
      "This package implements pdfTeX's escape features (@code{\\pdfescapehex},
 @code{\\pdfunescapehex}, @code{\\pdfescapename}, @code{\\pdfescapestring})